A liquid volume transfer system, comprising: a liquid infusion device, comprising a first communication module, a first controller and a first flow rate detecting module; a liquid container, comprising a second communication module; and an unmanned aerial vehicle, comprising a third communication module, a third controller and a second flow rate detecting module, wherein the first controller is configured to obtain a remaining liquid volume value from the second communication module through the first communication module, and to determine a target infused liquid volume value based on the remaining liquid volume value and a total infused liquid volume value; the first controller is further configured to receive a first flow rate signal output by the first flow rate detecting module, to calculate a liquid volume infused into the liquid container according to the first flow rate signal, to stop a liquid infusion operation when the liquid volume infused into the liquid container reaches the target infused liquid volume value, and to send the total infused liquid volume value to the second communication module through the first communication module; the second communication module is configured to receive the total infused liquid volume value sent by the first communication module; the third controller is configured to obtain the total infused liquid volume value from the second communication module through the third communication module, to receive a second flow rate signal output by the second flow rate detecting module in real time, and to determine a sprayed liquid volume value according to the received second flow rate signal after the completion of spraying; the third controller is further configured to determine the remaining liquid volume value based on the total infused liquid volume value and the sprayed liquid volume value, and to send the remaining liquid volume value to the second communication module through the third communication module; the second communication module is configured to receive the remaining liquid volume value sent by the third communication module. a liquid infusion device, comprising a first communication module, a first controller and a first flow rate detecting module; a liquid container, comprising a second communication module; and an unmanned aerial vehicle, comprising a third communication module, a third controller and a second flow rate detecting module, wherein the first controller is configured to obtain a remaining liquid volume value from the second communication module through the first communication module, and to determine a target infused liquid volume value based on the remaining liquid volume value and a total infused liquid volume value; the first controller is further configured to receive a first flow rate signal output by the first flow rate detecting module, to calculate a liquid volume infused into the liquid container according to the first flow rate signal, to stop a liquid infusion operation when the liquid volume infused into the liquid container reaches the target infused liquid volume value, and to send the total infused liquid volume value to the second communication module through the first communication module; the second communication module is configured to receive the total infused liquid volume value sent by the first communication module; the third controller is configured to obtain the total infused liquid volume value from the second communication module through the third communication module, to receive a second flow rate signal output by the second flow rate detecting module in real time, and to determine a sprayed liquid volume value according to the received second flow rate signal after the completion of spraying; the third controller is further configured to determine the remaining liquid volume value based on the total infused liquid volume value and the sprayed liquid volume value, and to send the remaining liquid volume value to the second communication module through the third communication module; the second communication module is configured to receive the remaining liquid volume value sent by the third communication module.