The present invention provides a semi-axle assembling detection device. The device comprises a first rod component, a second rod component and an interference device, wherein the second rod component is rotatably connected with the first rod component through a rotating shaft device, the first rod component and the second rod component both extend along the radial direction of the rotating shaft device, and the interference device applies an interference force to the relative rotation of the first rod component and the second rod component, wherein the interference force has a set value. The semi-axle assembling detection device of the present invention adopted, the improvement of the safety of an automobile can be benefitted.