Lifting hydraulic oil cylinder

The utility model belongs to the technical field of hydraulic equipment and discloses a lifting hydraulic oil cylinder which is used for solving the problem of potential safety hazards existing in existing hydraulic oil cylinders. The lifting hydraulic oil cylinder comprises a cylinder barrel. The cylinder barrel is provided with a piston and a piston rod in a matched mode. The upper end of the cylinder barrel is provided with a first hydraulic oil inlet/outlet. The lower end of the cylinder barrel is provided with a second hydraulic oil inlet/outlet. The first hydraulic oil inlet/outlet and the second hydraulic oil inlet/outlet are each provided with a valve in a matched mode. A supporting leg is connected to the bottom end of the cylinder barrel. A cylinder cover is connected to the top end of the cylinder barrel. One end of the piston rod penetrates through the cylinder cover and is connected with the piston arranged in the cylinder barrel. The other end of the piston rod is connected with an ejector plate. A floating piston is arranged in the cylinder barrel in a matched mode and located between the first hydraulic oil inlet/outlet and the piston. A floating piston is arranged in the cylinder barrel in a matched mode and located between the second hydraulic oil inlet/outlet and the piston. Each floating piston is provided with two buffer valves which make hydraulic oil between the piston and the floating piston to flow mutually. Potential safety hazards of the lifting hydraulic oil cylinder can be eliminated, and the safety performance of the hydraulic oil cylinder can be improved.