A waste collection device for collecting waste generated in a medical process and docking with a docking device to discharge the waste, the waste collection device comprising: a portable cart; at least one waste collection container mounted to the portable cart and configured to store waste generated in a medical process; a mating bracket mounted to the portable cart and configured to mate with the docking device; two collection end connectors (112, 114) attached to the mating bracket and respectively connected to the at least one waste collection container, wherein one of the collection end connectors (112, 114) is used to discharge the waste in the waste collection container, and the other is used to introduce a cleaning solution for cleaning the at least one waste collection container; two floating sleeve heads (111, 113) mounted to the mating bracket and correspondingly sleeved on the two collection end connectors (112, 114), wherein the floating sleeve heads (111, 113) are used to guide docking end connectors (212, 214) in the docking device to connect with the corresponding collection end connectors (112, 114), and the floating sleeve heads (111, 113) are floatingly moveable relative to the mating bracket and guide the docking end connectors (212, 214) to engage with the corresponding collection end connectors (112, 114); wherein the mating bracket includes a fixed plate and a guide plate, and the two floating sleeve heads (111, 113) are mounted to the fixed plate; and the guide plate and the fixed plate form a mating space for receiving a mating head part in the docking device; wherein the fixed plate includes two fixed through holes (153, 163) for mounting the two floating sleeve heads (111, 113), and the fixed plate further includes two limiting fixed sleeves (134, 144) mounted in the two fixed through holes (153, 163) respectively; characterized in that the floating sleeve head each includes a floating sleeve sleeved on the collection end connector and passed through the limiting fixed sleeve, including a guide port for guiding the docking end connector and a floatable port for mating with the limiting fixed sleeve in an initial state; wherein when the docking end connector of the docking device is not inserted, the floatable port is mated with the limiting fixed sleeve, and the floating sleeve head is in the initial position; and during the process of the insertion of the docking end connector, the floatable port moves relative to the limiting fixed sleeve and guides the docking end connector to align with the corresponding collection end connector; and, a first elastic member positioned between the guide port and the limiting fixed sleeve and configured to limit the range of the movement of the floating sleeve during the process of the insertion of the docking end connector and to return the floating sleeve head back to the initial state after the docking end connector is removed. a portable cart; at least one waste collection container mounted to the portable cart and configured to store waste generated in a medical process; a mating bracket mounted to the portable cart and configured to mate with the docking device; two collection end connectors (112, 114) attached to the mating bracket and respectively connected to the at least one waste collection container, wherein one of the collection end connectors (112, 114) is used to discharge the waste in the waste collection container, and the other is used to introduce a cleaning solution for cleaning the at least one waste collection container; two floating sleeve heads (111, 113) mounted to the mating bracket and correspondingly sleeved on the two collection end connectors (112, 114), wherein the floating sleeve heads (111, 113) are used to guide docking end connectors (212, 214) in the docking device to connect with the corresponding collection end connectors (112, 114), and the floating sleeve heads (111, 113) are floatingly moveable relative to the mating bracket and guide the docking end connectors (212, 214) to engage with the corresponding collection end connectors (112, 114); wherein the mating bracket includes a fixed plate and a guide plate, and the two floating sleeve heads (111, 113) are mounted to the fixed plate; and the guide plate and the fixed plate form a mating space for receiving a mating head part in the docking device; wherein the fixed plate includes two fixed through holes (153, 163) for mounting the two floating sleeve heads (111, 113), and the fixed plate further includes two limiting fixed sleeves (134, 144) mounted in the two fixed through holes (153, 163) respectively; characterized in that the floating sleeve head each includes a floating sleeve sleeved on the collection end connector and passed through the limiting fixed sleeve, including a guide port for guiding the docking end connector and a floatable port for mating with the limiting fixed sleeve in an initial state; wherein when the docking end connector of the docking device is not inserted, the floatable port is mated with the limiting fixed sleeve, and the floating sleeve head is in the initial position; and during the process of the insertion of the docking end connector, the floatable port moves relative to the limiting fixed sleeve and guides the docking end connector to align with the corresponding collection end connector; and, a first elastic member positioned between the guide port and the limiting fixed sleeve and configured to limit the range of the movement of the floating sleeve during the process of the insertion of the docking end connector and to return the floating sleeve head back to the initial state after the docking end connector is removed.