Compact hydraulic tail gate with lifting function and control method thereof

The invention belongs to the field of vehicle equipment, and relates to a compact hydraulic tail gate with a lifting function and a control method thereof.The compact hydraulic tail gate comprises a tail gate body and a composite motion oil cylinder connected with the tail gate body, and the composite motion oil cylinder comprises a rotary motion oil cylinder and a linear motion oil cylinder which are sequentially connected from top to bottom; the tail door comprises a tail door body and a tail door rotating shaft fixedly connected with one side of the tail door body, a piston is arranged in the linear motion oil cylinder, the two sides of the piston are connected with a first piston rod and a second piston rod respectively, the second piston rod is inserted into an output shaft of the rotary motion oil cylinder and connected with the output shaft through a spline, and the first piston rod is hinged to the tail door rotating shaft. Therefore, the tail gate can drive a heavy object to lift vertically, has the