The invention belongs to the field of machines and particularly discloses a stator snap spring molding mechanism which comprises a cylinder power device, a snap spring molding device. The cylinder power device is composed of a cylinder, a cylinder positioning clamping piece and a worktable. The snap spring molding device is composed of a base and a molding body, wherein the molding body comprises a push block, a push rod, a side punching shell, an upper trapezoidal shaft, a lower trapezoidal shaft, a spring, a needle bearing, a cylindrical pin and a bottom cap. By adoption of the stator snap spring molding mechanism, according to the inner structure of a stator and the shape of a to-be-molded part of a snap spring, the cylinder is used for supplying molding power, and under the effect of the cylinder, the upper trapezoidal shaft and the lower trapezoidal shaft are driven by a piston rod to move downwards so as to enable the needle bearing to roll, and the spring is compressed to push the push block to move radially, and the snap spring is bend-molded; and after the snap spring is molded, the cylinder restores to drive the piston rod to enable the upper trapezoidal shaft and the lower trapezoidal shaft to move upwards, the compressed spring pushes the needle bearing to roll reversely to enable the push block and the push rod to return to the original position, and the whole snap spring molding process is completed.