The utility model discloses a press fitting device for a seal ring of a bearing. The press fitting device comprises a positioning sleeve barrel, a guiding sleeve barrel and a pressing head, wherein the positioning sleeve barrel is used for being matched with a bearing saddle bore in a sliding manner; the guiding sleeve barrel is coaxially and fixedly connected to the upper end of the positioning sleeve barrel; the pressing head is arranged in the positioning sleeve barrel and matched with the inner wall of the positioning sleeve barrel in a sliding manner; a transmission thread is arranged on the internal circumstantial surface of the guiding sleeve barrel, and the guiding sleeve barrel is connected with a thread pressing rod through the transmission thread; the thread pressing rod and the guiding sleeve barrel form a screw nut pair and the lower end of the thread pressing rod is jacked and pressed on the upper end face of the pressing head. According to the press fitting device for the seal ring of the bearing, the screw pressing rod is rotated, so that the screw pressing rod can travel in the axial direction to push the pressing head to press the seal ring of the bearing into a mounting hole of the sealing ring uniformly and accurately, so that the press fitting process of the sealing ring of the bearing is simplified, the mounting accuracy is improved, the sealing ring of the bearing is prevented from being crushed, so that the product qualification ratio is improved.