A seal head used on a side beam of a vehicle carrier includes a main plane covering the front surface of the side beam, a side plane connected to the main plane to cover the inclined surface of the side beam, a first baffle plane and a second baffle plane covering the edges of the side beam, and the main plane, side plane, first baffle plane and second baffle plane form a semi-enclosed cavity for receiving the side beam. The baffle planes can be fixed against the corresponding edges of the side beam to achieve reliable fixed positions and connections, increasing the shock resistance rigidity and strength of the front surface of the side beam and easy installation and disassembly for seal head. The main plane, the side plane and the baffle plane are in an integrally molded piece to improve the rigidity and strength of side beam.