Assembly type pneumatic fixed seat

The invention discloses an assembly type pneumatic fixed seat which comprises a cushion plate, a wedge, a fixed ring, a stamping assembly, a returning part, a main body, a rear cushion plate, a push block and a cylinder driving the push block to move. The cushion plate is installed on the top wall of the main body, an accommodating space is formed between the cushion plate and the top wall of the main body, the rear cushion plate is installed at the rear of the main body, the cylinder is located at the rear of the rear cushion plate, so that the integral sealed type structure is formed, the integral pressure resistance is improved, it is guaranteed that dust and sweeps do not enter the fixed seat in the stamping process, and the normal running and service life of the fixed seat are guaranteed. The fixed seat is simple and reliable in structure and convenient and quick to use, die processes are greatly simplified, the die manufacturing cost is greatly reduced, one-time stamping of switchover type intensive hole locations is achieved fully in limited space of a die, and various problems occurring in the using process of ordinary assembly type pneumatic fixed seats are solved.