The invention discloses a high-sealability thickened oil rotor pump. The two ends of a bearing pedestal of the thickened oil rotor pump are connected with a pump cover and a pump body respectively; the two ends of a reduction gearbox body are connected with reduction gearbox end covers; the pump body is connected and communicated with the reduction gearbox body through a driven shaft and a driving shaft; the driven shaft and the driving shaft of the rotor pump are connected with transmission gears in the reduction gearbox body, and are connected with rotors in the pump body; shaft sleeves are arranged between the driven shaft and the bearing pedestal and between the driving shaft and the bearing pedestal; mechanical sealing devices are arranged at the two sides of the driven shaft and driving shaft in the pump body of the rotor pump; shaft end cushion blocks are arranged between the mechanical sealing devices and the pump body; sealing rings are arranged between the driven shaft and the reduction gearbox end covers and between the driving shaft and the reduction gearbox end covers; and a heat-conducting oil heating cavity is formed in the pump body. The rotor pump has good abrasion resistance and sealability; the application range and service life of the rotor pump are significantly enlarged and increased; the working efficiency is high; and the vibration noise is low.