Zero calibration and control method for oil cylinder

The invention relates to the field of ocean equipment control, in particular to a device capable of recalibrating a zero point and a control method. The zero calibration device for the oil cylinder comprises a motor, a shell, a cylinder barrel and a driver, the shell is connected with the cylinder barrel, cavities are formed between the shell and the cylinder barrel, the cylinder barrel is connected with the oil bag through the conveying pipe, and a sliding way is arranged on the surface of the shell. The motor is fixed in the cavity, the motor is connected with the driver through the encoder, the motor is fixedly provided with the pressing device through the sliding block, and the sliding block can move in the sliding way; the output end of the motor is connected with a screw rod which is provided with a piston; the shell is connected with a control assembly, and the pressing device presses the control assembly to control the motor. The motor pushes the piston through forward rotation or reverse rotation to