The utility model relates to an orbit varying device. The orbit varying device comprises a linear motor, a feeding push rod, a fixed bracket, a movable bracket, a linear orbit, an arc orbit, a linear crossway, an arc crossway, a main way, guide rails, expansion bolts, bottom fixing and reinforcing plates, lateral positioning plates, C-shaped upper chutes, T-shaped lower sliding blocks and a self-locking mechanism, wherein the linear motor is fixed on the fixed bracket, an output shaft of the linear motor is connected with the feeding push rod through a key, and the linear motor is used for applying torque in the linear direction to the feeding push rod; the feeding push rod is connected with the movable bracket through a pin shaft; two guide rails are distributed on the left and right sides of the linear motor, each guide rail comprises a C-shaped upper chute and a T-shaped lower sliding block, and the T-shaped lower sliding block capable of moving along the axial direction is mounted in the C-shaped upper chute. By controlling the linear motor, the feeding push rod is in an expanding or shrinking state, and circuits of the two guide rails are turned on or off, thereby achieving orbit varying; the orbit varying device is applicable to small-space sites, having orbit varying requirements, such as workshops and maintenance machine rooms of nuclear power stations.