Oil cylinder with built-in supercharging function

The utility model provides an oil cylinder with a built-in supercharging function, which relates to the technical field of oil cylinders and comprises a cylinder body, a guide sleeve is mounted at the front end of the cylinder body, a front end cover is mounted at the front end of the guide sleeve, the guide sleeve and the front end cover are mounted on the cylinder body through bolts, a rear end cover is mounted at the rear end of the cylinder body through bolts, and the rear end cover is mounted on the cylinder body through bolts. A part of the rear end cover extends into the cylinder body, a working oil cavity and a pressurizing cavity are formed in the cylinder body, the pressurizing cavity is arranged close to the rear end cover, a pressurizing piston with a T-shaped section is arranged in the pressurizing cavity, the small end of the pressurizing piston is inserted into the working oil cavity, and a servo motor is arranged on the side, away from the pressurizing piston, of the rear end cover. The built-