Oil cylinder with positioning function

The oil cylinder with the positioning function comprises an oil cylinder body, a piston rod and an oil cylinder base, one side of the oil cylinder base is provided with a power source and a communication line hole, a cavity connected with the power source and the communication line hole is formed in the oil cylinder base, and the piston rod is arranged in the cavity. A cavity is formed in the oil cylinder base, a circuit board, a magnetic conductive pressure-resistant plate and a stay wire type encoder mechanical part structure are sequentially arranged in the cavity, an oil seal is arranged in a groove in an outer ring of the stay wire type encoder mechanical part structure, an oil through hole is formed in one side of the oil cylinder base in a penetrating mode, and a wire outlet hole is formed in the middle of the bottom end of the oil cylinder base. The device has the advantages that the extending length of the oil cylinder body is controlled according to the mechanical part structure of the stay wire typ