Convenient-to-use sputum remaining device for respiratory medicine department

The sputum remaining device comprises a tank body, the top of the tank body is of an opening structure, the bottom end of the tank body is fixedly sleeved with a lower end cover, the top of the tank body is movably sleeved with an upper end cover, the top of the upper end cover is fixedly provided with a liquid pumping box, and a piston plate is arranged in the liquid pumping box. The piston plate is in sliding sealing contact with the inner wall of the liquid pumping box, a vertical rod is fixedly installed at the top of the piston plate, a through hole is formed in the top of the liquid pumping box, and the top end of the vertical rod penetrates through the through hole. The sputum suction sampling tank is reasonable in design, good in practicability, convenient to operate and use, convenient for medical staff to manually operate to perform sputum suction sampling work on a patient, convenient for collecting sputum in the tank body for storage, free of equipment such as a sputum suction apparatus and the li