Keel punching machine capable of preventing paint surface from being scratched

The keel punching machine capable of preventing the paint surface from being scratched comprises a base, a punching mechanism and a fixing structure are arranged at the top of the base, conveying rollers are evenly fixed to the end face of the top face of the base, the punching mechanism comprises a punching oil cylinder and an inner die, a pressing plate is fixed to the output end of the punching oil cylinder, and the inner die is fixed to the pressing plate. Limiting cylinders are fixed to the four corners of the end face of the bottom of the pressing plate, limiting columns are sleeved with the limiting cylinders, the bottom ends of the limiting columns are fixed to the base, a punch is fixed to the center of the bottom of the pressing plate, the fixing structure comprises a top plate, and the top plate is arranged at the bottom of the punch. Receding holes are formed in the center of the surface of the top plate and the interior of the inner mold, side plates are symmetrically fixed to the two sides of th