Vehicle transport semi-trailers are specialized transportation tools designed with a fence structure. Their bodies are of a rod frame structure and are mainly used for transporting passenger cars such as sedans, vans, and business vehicles. Its cabin is equipped with two layers of hydraulic lifting platforms. Through a truss frame, its self-weight is reduced by about 30% compared to similar models, and it is also equipped with a leaf spring lower-mounted suspension system to enhance driving stability. This model is divided into frame type, semi-enclosed type and fully enclosed type. The lifting control operation of all loading and unloading platforms is reliable and easy to observe.