Liquid transfer device

A liquid transfer device, comprising:

• a pressing unit;
• a housing;
• a connecting member;
• and
• a liquid extraction assembly;
• wherein the pressing unit comprises a pressing body, a first top wall disposed on an end of the pressing body, and an extrusion portion disposed on the first top wall away from the pressing body, the housing comprises a first sidewall and a second top wall connected to the first sidewall, the first sidewall and the second top wall cooperatively define a receiving cavity, the pressing unit is received in the receiving cavity, the connecting member comprises a second sidewall and a first connecting portion connected to the second sidewall, the second sidewall is detachably connected to an end of the first sidewall close to the second top wall, the liquid extraction assembly comprises a liquid extraction pipe, a liquid extraction head, and a second connecting portion, the liquid extraction head is connected to the liquid extraction pipe through the second connecting portion, the liquid extraction assembly extends into the receiving cavity through the second top side and corresponds to the extrusion portion, the second connecting portion is detachably connected to the first connecting portion, the liquid extraction head is disposed out of the receiving cavity;
• wherein the pressing unit is configured to move back and forth along a central axis of the receiving cavity, so as to drive the extrusion portion to move back and forth relative to the liquid extraction pipe, thereby causing the liquid extraction pipe to be compressed and rebounded to release or absorb a liquid, respectively.