Fixed hydraulic boarding bridge (also known as height adjusting plate/unloading platform or electro-hydraulic platform) is a special auxiliary equipment for fast loading and unloading of goods. It is installed on platforms and buildings, and connected to freight cars to adjust the height difference between platforms, buildings and cars. The turnable lapping plate at the front end of the boarding bridge is always close to the carriage when loading and unloading goods. The angle adjustment function of the boarding bridge enables a bridge to be built between the truck and the building ground, and various carriers can smoothly pass the boarding bridge to transport goods between the building ground and the carriages. In addition, only one operator is required to operate, which can realize the rapid loading and unloading of goods. It enables enterprises to reduce a lot of labor, improve work efficiency, and obtain greater economic benefits. It is the best choice for modern enterprises to work safely and improve the speed of material circulation.