The invention discloses a pneumatic fixture for a numerical control machine tool. The pneumatic fixture comprises a base and machining positions. Each machining position comprises a fixed baffle, a supporting base and a moving groove, a clamping block is connected between the fixed baffle and the supporting base through a screw rod, one end of the screw rod penetrates through the supporting base, is installed in a movable base, and extends out of the movable base to be connected with a cylinder, and the movable base is installed in the moving groove and can move in the moving groove. Three machining positions are arranged on the base in parallel. The outer sides of the machining positions on the base are further provided with pressing devices. Each pressing device comprises a rack, a pressing block and an adjusting bolt, a movable groove is formed in the middle of the pressing block, the adjusting bolt is arranged in the movable groove, and the position of the pressing block is adjusted by loosening and tightening the adjusting bolt. The pneumatic fixture greatly improves stability of products during machining, machining precision is guaranteed, product quality is improved, and the defective rate is lowered.