Trailer coupling

The utility model discloses a trailer coupler, which belongs to the field of vehicle-mounted accessories, simplifies the structure of the trailer coupler and reduces the cost on the premise of ensuring the connection strength, and comprises a mounting seat and a towing hook detachably connected with the mounting seat, the mounting seat is provided with a mounting cavity with one open end, and the towing hook is detachably connected with the mounting seat. The towing hook comprises a connecting part inserted into the mounting cavity, a sliding groove and a locking pin slidably mounted in the sliding groove are arranged on the connecting part, and the sliding groove obliquely extends from one end of the connecting part to the other end of the connecting part and is provided with a first opening penetrating through the side wall of the connecting part. The towing hook further comprises an operation part used for driving the locking pin to move along the sliding groove, the locking pin extends out of the first op