The utility model discloses a rotor pressing ring, which comprises a pressing ring, a rotating shaft arranged on the inner side of the pressing ring, and a heat dissipation device arranged on the pressing ring, the heat dissipation device comprises fan blades, ventilation slots, a fixing table and heat dissipation holes, the fan blades are arranged on the side wall of the fixing table, the fixing table is arranged on the inner side of the pressing ring, the heat dissipation holes are arranged on the pressing ring, and the ventilation slots are arranged on the side wall of the pressing ring. A fixing device is installed on one side of the fixing table and comprises a fixing plate, a limiting sleeve, a rotating rod, an inserting sleeve, a reducing groove, a clamping block, a clamping groove and a positioning groove, the inserting sleeve is arranged on one side of the pressing ring, the limiting sleeve is installed in the inserting sleeve, the rotating rod is installed in the limiting sleeve, the clamping groove is formed in the inner side of the inserting sleeve, the clamping block is clamped in the clamping groove, and the fixing plate is installed on one side of the limiting sleeve. According to the novel pressure ring, the function is complete, and the problems of an existing pressure ring in the aspects of heat dissipation, fan mounting and dismounting and the like are effectively solved.