A liquid collecting mechanism that includes a liquid collection tube arm and a liquid collection tube head fixed at a front end of the tube arm. A sealing spacer is arranged at a joint connecting the liquid collection tube head and the liquid collection tube arm, and the liquid collection tube head is internally provided with a liquid collection cavity. An area of the liquid collection tube head located above the liquid collection cavity is a mesh collection area, and a plurality of collecting holes is provided in the mesh collection area. The mechanism includes a liquid suction tube passing through the tube arm and tube head, and the liquid suction tube has an open first end located in the liquid collection cavity and an open second end configured to connect with a pump body mechanism.
