Liquid adding device for POCT equipment and using method of liquid adding device

The invention provides a liquid adding device for POCT (point-of-care testing) equipment and a use method of the liquid adding device, the liquid adding device is provided with a three-way electromagnetic valve, three interfaces are respectively connected with a peristaltic pump, a liquid adding needle and a reagent bottle, the peristaltic pump is a device for transporting fluid, and the peristaltic pump is a hose filled with the fluid and clamped by a roller; the fluid in the pipe is driven to move forwards along with forward sliding of the roller; fluid is pumped by alternately extruding and releasing the elastic conveying hose of the pump, negative pressure is formed in the hose under the action that the hose is clamped and extruded by the roller, liquid flows between the liquid adding needle and the reagent bottle, no waste liquid is generated in the whole process, and a waste liquid device is not needed; the device is suitable for liquid adding work of universal reagents such as diluent, cleaning liquid,