The invention relates to a variable-frequency centrifugal rod pipe blanking machine based on hydraulic compensation. The machine comprises a hydraulic cylinder bracket, a hydraulic cylinder, a synchronous belt, a fixed bearing box, a three-phase alternating-current motor, a slide bearing box, a rotating push disc, a triangular block, a connecting block, a rod fixture, a frame, a deep groove ball bearing, a two-way thrust ball bearing, a main shaft, a slide block, a wear resistant bearing with grooves on the inner surface at equal intervals, and a material block guide groove. The machine precisely blanks rod pipes by fully using hydraulic compensation, the centrifugal effect and the stress concentration effect based on a low-stress blanking technology. During blanking, sharp annular V-shaped grooves are formed in the peripheries of the surfaces of metal rod pipes beforehand; and then, the rod pipes are peripherally extruded by using the rotating centrifugal force and the hydraulic compensation force. Under the effect of centrifugal force and hydraulic compensation force, cracks are generated in the stress concentration places of the V-shaped groove. According to traditional rupture theoretical knowledge, after the cracks at the tip ends of the V-shaped grooves are generated, the cracks can quickly expand along the radial surfaces to totally break finally, so that the blanking is realized.