Multifunctional hydraulic cylinder

The utility model discloses a multifunctional hydraulic cylinder. The multifunctional hydraulic cylinder comprises a cylinder body and a piston rod which can slide freely inside the cylinder body. Two connectors are formed in two edges of the bottom of the cylinder body. One connector is sequentially connected with a port of a control valve and an oil groove in series through oil pipes. The other connector is sequentially connected with a pressure-limiting valve, a flowmeter, another port of the control vale, a hydraulic pump and the oil groove in series through oil pipes. The hydraulic pump is in parallel connection with a safety valve. According to the multifunctional hydraulic cylinder, the normally-open pressure-limiting valve and the flowmeter are connected in a hydraulic system in series, whether the hydraulic cylinder leaks or not can be judged through pressure regulation of the pressure-limiting valve, the leakage quantity of the hydraulic cylinder can be detected, and therefore the multifunctional hy