A medical anastomosis device comprising: a firing assembly comprising a staple cartridge push rod which is provided with a banking pin; an anvil seat comprising a safety block to mate with the banking pin, the safety block defining a slot; an anvil assembly; and a staple cartridge assembly; wherein the firing assembly configured to drive the staple cartridge assembly to move from a proximal end of the anvil seat to a distal end of the anvil seat; and wherein the anvil seat comprises therein a restriction portion to mate with the safety block; wherein when the medical anastomosis device is in an initial status in which the staple cartridge assembly containing staples has been assembled to the anvil seat, the safety block is of non-interference with the banking pin and the restriction portion; when the medical anastomosis device is in a firing status, movement of the safety block is restricted by the restriction portion of the anvil seat, and the slot is located in a movement route of the banking pin when the banking pin moves from a distal end of the medical anastomosis device to a proximal end of the medical anastomosis device and the safety block abuts against the restriction portion; and when the medical anastomosis device returns to the initial status after being completely fired, the banking pin is locked in the slot so that the banking pin can be restricted by the safety block along a direction from the proximal end of the medical anastomosis device to the distal end of the medical anastomosis device characterized in that the anvil seat comprises therein a safety block seat to mount the safety block, the safety block is pivotally connected to the safety block seat, and the restriction portion is formed on the safety block seat. a firing assembly comprising a staple cartridge push rod which is provided with a banking pin; an anvil seat comprising a safety block to mate with the banking pin, the safety block defining a slot; an anvil assembly; and a staple cartridge assembly; wherein the firing assembly configured to drive the staple cartridge assembly to move from a proximal end of the anvil seat to a distal end of the anvil seat; and wherein the anvil seat comprises therein a restriction portion to mate with the safety block; wherein when the medical anastomosis device is in an initial status in which the staple cartridge assembly containing staples has been assembled to the anvil seat, the safety block is of non-interference with the banking pin and the restriction portion; when the medical anastomosis device is in a firing status, movement of the safety block is restricted by the restriction portion of the anvil seat, and the slot is located in a movement route of the banking pin when the banking pin moves from a distal end of the medical anastomosis device to a proximal end of the medical anastomosis device and the safety block abuts against the restriction portion; and when the medical anastomosis device returns to the initial status after being completely fired, the banking pin is locked in the slot so that the banking pin can be restricted by the safety block along a direction from the proximal end of the medical anastomosis device to the distal end of the medical anastomosis device characterized in that the anvil seat comprises therein a safety block seat to mount the safety block, the safety block is pivotally connected to the safety block seat, and the restriction portion is formed on the safety block seat.