Semi-trailer power device

The utility model discloses a semi-trailer power device. The semi-trailer power device comprises a rack. The left end of the rack is of a closed structure, and a pump and an oil tank are arranged inside the left end of the rack. The right side of the closed structure of the left end of the rack is fixedly connected with an engine through a flange, wherein the engine is a diesel engine. A storage battery is arranged at the lower end of the right side of the rack. A filter, an oil-filling port and a control valve are fixedly arranged at the left end of the top of the rack, wherein the oil-filling port is located in the left side of the filter. An oil return port is formed in the left end of the control valve, and an oil inlet is formed in the right end of the control valve. The storage battery is arranged, and therefore an external power source is not needed. The left end of the rack is of the closed structure, the oil tank, the pump and the flange can be connected in a sealed mode, and therefore oil can be prevented from leaking. Single-cylinder diesel engine horizontal type installation is adopted, in this way, the appearance size is small, and the semi-trailer power device can be directly installed under a semi-trailer body. The semi-trailer power device is reasonable in design, simple in structure, attractive in appearance, convenient to use, high in safety, high in power and good in stability.