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

The invention relates to the technical field of surgery, and discloses a surgical sputum suction device capable of changing negative pressure intensity and intermittently sucking sputum. The surgicalsputum suction device comprises a shell. The whole device is supported and stabilized; a collecting bottle is fixedly connected to the upper portion of the shell; through cooperative use of a piston,a push rod, a first connecting rod, a second connecting rod and a swing shaft, negative pressure can be intermittently generated to suck out the sputum, discomfort of a patient in a negative pressurestate for a long time is avoided, and discomfort in the sputum suction process is reduced; the negative pressure intensity of the device can be adjusted through cooperative use of a fixed plate, a rotating shaft and a rotating button, so that the proper negative pressure can be selected according to the conditions of different patients, and the practicality of the device is improved; and through cooperative use of a rotatin