A body frame joint, comprising: a transverse beam connecting plate, provided with a first transverse beam mounting member and a second transverse beam mounting member and mounted to a transverse beam of a body frame by the first transverse beam mounting member and the second transverse beam mounting member; and a longitudinal beam connecting plate, connected with the transverse beam connecting plate, provided with a first longitudinal beam mounting member and a second longitudinal beam mounting member and mounted to a longitudinal beam of the body frame by the first longitudinal beam mounting member and the second longitudinal beam mounting member, wherein a central axis of the first transverse beam mounting member and a central axis of the first longitudinal beam mounting member are located in a first plane; a central axis of the second transverse beam mounting member and a central axis of the second longitudinal beam mounting member are located in a second plane; and the first plane and the second plane are arranged in parallel; wherein the first transverse beam mounting member comprises a first transverse screw rod; the second transverse beam mounting member comprises a second transverse screw rod; wherein the transverse beam is configured with a first transverse sliding groove and a second transverse sliding groove; the longitudinal beam is configured with a first longitudinal sliding groove and a second longitudinal sliding groove; characterized in that an inner side surface of the transverse beam connecting plate and an inner side surface of the longitudinal beam connecting plate are provided with a first inner rib; the first inner rib on the transverse beam connecting plate is connected with the first inner rib on the longitudinal beam connecting plate by a first corner rib; provided at a junction of the transverse beam connecting plate and the longitudinal beam connecting plate; wherein the inner side surface of the transverse beam connecting plate and the inner side surface of the longitudinal beam connecting plate are further provided with a second inner rib; the second inner rib on the transverse beam connecting plate is connected with the second inner rib on the longitudinal beam connecting plate by a second corner rib provided at the junction of the transverse beam connecting plate and the longitudinal beam connecting plate; a thickness of the first corner rib is greater than a thickness of the first inner rib; and a thickness of the second corner rib is greater than a thickness of the second inner rib. a transverse beam connecting plate, provided with a first transverse beam mounting member and a second transverse beam mounting member and mounted to a transverse beam of a body frame by the first transverse beam mounting member and the second transverse beam mounting member; and a longitudinal beam connecting plate, connected with the transverse beam connecting plate, provided with a first longitudinal beam mounting member and a second longitudinal beam mounting member and mounted to a longitudinal beam of the body frame by the first longitudinal beam mounting member and the second longitudinal beam mounting member, wherein a central axis of the first transverse beam mounting member and a central axis of the first longitudinal beam mounting member are located in a first plane; a central axis of the second transverse beam mounting member and a central axis of the second longitudinal beam mounting member are located in a second plane; and the first plane and the second plane are arranged in parallel; wherein the first transverse beam mounting member comprises a first transverse screw rod; the second transverse beam mounting member comprises a second transverse screw rod; wherein the transverse beam is configured with a first transverse sliding groove and a second transverse sliding groove; the longitudinal beam is configured with a first longitudinal sliding groove and a second longitudinal sliding groove; characterized in that an inner side surface of the transverse beam connecting plate and an inner side surface of the longitudinal beam connecting plate are provided with a first inner rib; the first inner rib on the transverse beam connecting plate is connected with the first inner rib on the longitudinal beam connecting plate by a first corner rib; provided at a junction of the transverse beam connecting plate and the longitudinal beam connecting plate; wherein the inner side surface of the transverse beam connecting plate and the inner side surface of the longitudinal beam connecting plate are further provided with a second inner rib; the second inner rib on the transverse beam connecting plate is connected with the second inner rib on the longitudinal beam connecting plate by a second corner rib provided at the junction of the transverse beam connecting plate and the longitudinal beam connecting plate; a thickness of the first corner rib is greater than a thickness of the first inner rib; and a thickness of the second corner rib is greater than a thickness of the second inner rib.