Automobile wire harness butt joint protection device

The utility model relates to the technical field of automobile wire harness butt joint protection devices, and discloses an automobile wire harness butt joint protection device which comprises a protection box, the front end and the rear end of the upper end of the protection box are both connected with wire harness penetrating pipes, auxiliary assemblies are arranged at the positions, close to the lower portions of the wire harness penetrating pipes, of the front end and the rear end of the protection box, and each auxiliary assembly comprises an inclined column. The inclined column is fixedly installed at the front end of the protection box and located below the wire harness penetrating pipe, a supporting plate is fixedly installed at one end of the inclined column, an arc-shaped supporting plate is arranged above the supporting plate, four cylinders are fixedly installed at the positions, close to the bottom end, of the outer portion of the arc-shaped supporting plate, and buffer springs are fixedly instal