The invention provides a shaft deviator. In the shaft deviator, an input shaft can be in homodromous rotation and in reversing rotation with an output shaft. The shaft deviator comprises a box body, a first bevel gear, a second bevel gear, a drive bevel gear, a reversing shaft and the input shaft, wherein the first bevel gear, the second bevel gear and the drive bevel gear can be rotated relativeto the box body; the second bevel gear is extended out of the box body to be connected with the output shaft; the first bevel gear is opposite to the second bevel gear; the first bevel gear is in transmission with the second bevel gear through the drive bevel gear; a first keyhole is formed on the first bevel gear; a second keyhole is formed on the second bevel gear; the reversing shaft passes through the first bevel gear; the input shaft is arranged in the reversing shaft; a bond axis part which can be matched with the first keyhole and the second keyhole respectively is arranged at one end in the box body of the reversing shaft; and a lifting and pulling part used for driving the reversing shaft to do axial motion is arranged at one end of the reversing shaft outside the box body. The shaft deviator can solve the problem that because a driving technique opposite to the other back-off technique must be adopted when a connecting body of a tractor and a trailer backs off, the connecting body is difficult to drive.