The utility model relates to the technical field of cloth
cutting, in particular to a pneumatic
cutting knife which comprises an installation
handle and a
cutting knife body, an air
pipe connector is arranged at one end of the installation
handle, and a telescopic piece is connected in the installation
handle through an air pumping mechanism. The telescopic part comprises a clamping ring, a fixing cylinder is fixedly connected to the inner wall of the clamping ring, a sliding rod is slidably connected to the inner wall of the fixing cylinder in a sealed mode, one end of the sliding rod is elastically connected with the inner wall of the fixing cylinder through a spring, and a sliding block is fixedly connected to the end, away from the fixing cylinder, of the sliding rod. According to the cloth cutting device, the cutter moves rightwards to
cut cloth, the manual adjusting valve is arranged, the flow of gas flowing through the adjusting cavity can be adjusted, then the moving distance of the cutter can be adjusted, cloth with different thicknesses can be
cut, and the situation that an electric push rod is used for stretching and retracting the cutter back and forth to
cut the cloth at present is avoided; the cost required in the using process is increased, and the operation of replacing electric push rods of different models back and forth is tedious.