The invention discloses a cutting device with a clamping function. The cutting device comprises a base. A sliding groove is formed in the top of the base. A first clamping block is fixedly connected to one side of the sliding groove. A bottom plate is further arranged on the top of the base. The top of the bottom plate is movably connected with a rotating shaft. The top of the rotating shaft is fixedly connected with a cutting device body. The front face of the cutting device body is fixedly connected with a first push rod. The bottom of the first push rod is fixedly connected with a first piston, and the first push rod is inserted into an L-shaped air pressure pusher. The bottom of the first piston is fixedly connected with a stay wire. The middle portion of the interior of the L-shaped air pressure pusher is movably with an idler wheel. The stay wire is movably connected with a second piston through the idler wheel. The right end of the second piston is fixedly connected with a second push rod. According to the cutting device with the clamping function and by means of the arrangement that the L-shaped air pressure pusher is pushed through the cutting device body, the effect of manual extruding of a cut object is changed, the manual extruding dangerousness is avoided, the cutting precision is enhanced, the production efficiency is improved, and the production cost is reduced.