Surgical sputum suction device capable of changing negative pressure intensity and intermittently generating negative pressure

The invention relates to the technical field of surgery, and discloses a surgical sputum suction device capable of changing negative pressure intensity and intermittently generating negative pressure.The surgical sputum suction device comprises a shell, wherein a waste liquid bottle is fixedly connected in the shell; a piston can be driven to intermittently move up and down through the cooperative use of the piston, a push rod, a rack, a swing rod and a rotating disc, so that the negative pressure is intermittently generated; the negative pressure time of each time is consistent, so that theconsistency of sputum suction time is guaranteed, and the discomfort of a patient in the sputum suction process caused by long-time continuous negative pressure increase is avoided; the negative pressure strength of the device can be adjusted through cooperative use of a threaded rod and a rotating wheel, the proper negative pressure strength can be selected according to the actual conditions of different patients, and the