Pneumatic dismounting device for nozzle shell

The utility model discloses a pneumatic dismounting device for a nozzle shell, a plurality of fixing pins for fixing the nozzle shell are arranged on the nozzle shell at intervals, the pneumatic dismounting device comprises a base, a clamping device arranged on the base and used for clamping a nozzle and a stamping device arranged on the base, and the stamping device comprises an air cylinder and a firing pin. The cylinder comprises a cylinder body which is fixedly arranged on the base and is provided with a hollow cavity and a piston rod which can be movably arranged in the cylinder body in the vertical direction, a plurality of striking pins are arranged at intervals corresponding to the fixing pins, and the striking pins are arranged at the ends, extending out of the cylinder body, of the piston rod and located above the fixing pins; the positions of the firing pins correspond to the positions of the fixing pins in a one-to-one mode, the diameter of the firing pins is not larger than that of the fixing pin