The wide body design of the conveyor belt inside the box has an effective width of about 2200mm, which can achieve forward and reverse operation, allowing for unloading and loading. Trailers can be used in conjunction with various towing vehicles, with good compatibility; Zero residual goods, no need for secondary cleaning of the carriage, saving time and effort. Remote control and monitoring system, no need to get off the vehicle and monitor the entire unloading process, safe and convenient. The overall hydraulic environmental protection box cover has good sealing performance, simple operation, high efficiency and speed, and is energy-saving and environmentally friendly.