Shaping device for inner wall of air duct of axial flow fan

The invention relates to the technical field of fans, and discloses a shaping device for the inner wall of the air duct of an axial flow fan. The shaping device comprises a base, a kidney-shaped sinking groove and an air duct placement block are formed on the base, a step through hole is formed in the air duct placement block, a shaping block is arranged over the step through hole, and the shaping block is detachably connected to an inserting part. The inserting part is fixed to the end of a piston rod of a vertically-arranged oil cylinder, the oil cylinder is fixed to a sliding seat, the sliding seat is slidably connected to a sliding rail, the sliding rail is fixed to a supporting frame, and the supporting frame is fixed to a base. The sliding seat is fixedly connected with a piston rod of a first air cylinder arranged in the left-right direction through a connecting block, the first air cylinder is fixed to an air cylinder support, and the air cylinder support is fixed to one supporting frame. A shaping bl