1. Transport the steel pipe to the rail car by a transport vehicle, which is equipped with a lifting device, and the steel pipe is located on the lifting device; The transport vehicle transports the steel pipe to the first position.

2. In the first position, the vertical projections of the steel pipe and the rail car bearing part overlap at least partially, and the lifting device lowers the steel pipe and places it on the rail car bearing part, and the bearing parts are respectively arranged on both sides of the steel pipe.

3. The transport vehicle exits the first position, and the steel pipe is transported away by the rail car. According to the invention, the rail car and the transport car are matched to complete the transportation of steel pipes, and lifting points and cranes are not needed, so that the transportation of steel pipes and similar components in a large tonnage or a narrow space can be realized, and the transportation is simple, convenient and practical, and the cost is low.