The invention belongs to the technical field of pumps, and particularly relates to a rotor pump for petrochemical engineering. The rotor pump comprises a shell, a rotor, a rotating disc and first sliding blocks; the shell is cylindrical; a group of arc convex blocks are arranged on the inner wall of the shell; the rotor is located in the shell and is matched with the arc convex blocks in shape; the first sliding blocks are arranged in the rotor; spiral grooves are formed in the peripheries of the first sliding blocks; the rotating disc is located in the rotor; and a group of spiral guide blocks are arranged in the rotating disc and are matched with spiral grooves in the first sliding blocks so as to enable the first sliding blocks to slide in a sliding groove in the periphery of the rotor.According to the rotor pump, the spiral guide blocks in the rotating disc mesh with the spiral grooves of the first sliding blocks in the rotor to rotate, the first sliding blocks are retracted intothe rotor, the contact area between the rotor and oil is changed, and therefore the amount of the oil transferred by the rotor is controlled.