The invention discloses a gimbal side bearing running-in device. The device comprises swinging rotating shaft supports, connecting blocks, swinging supports and support locating pins, wherein each swinging rotating shaft support is provided with a swinging rotating shaft in a string mode, one end of each connecting block is arranged on the corresponding swinging rotating shaft in a string mode, each swinging support is arranged at the end, connected with the corresponding swinging rotating shaft, of the corresponding connecting block in an erected mode, each swinging support is provided with at least one mounting hole, gimbals needing running-in are arranged in the mounting holes of the swinging supports, the support locating pins are arranged on the gimbals and transversely stretch out, the inner wall of the mounting hole of each swinging support is provided with at least one support locating groove parallel with or vertical to the corresponding rotating shaft in the axial direction, and when the gimbals are arranged in the mounting holes, the support locating pins are embedded in the support locating grooves. The gimbal side bearing running-in device meets the requirement of gimbal side bearing running-in, has the advantages of being reasonable in design, simple in structure, convenient to operate and high in production efficiency, carries out running-in on a gimbal side bearing effectively and solves the problem that running-in cannot be conducted on the gimbal side bearing after the bearing is assembled.