Adjustable oil cylinder

The utility model relates to the technical field of oil cylinders, in particular to an adjustable oil cylinder which comprises a cylinder body and a piston rod movably arranged in the cylinder body. Athrough hole is formed in the piston rod in a penetrating manner; an internal thread is arranged in the through hole; the adjustable oil cylinder further comprises a lead screw. The lead screw is provided with an external thread; the lead screw is arranged in the through hole in a penetrating manner and is in threaded connection with the through hole; the adjustable oil cylinder further comprisesa locking block and a limiting plate connected with the cylinder body. The locking block is connected with the piston rod; the locking block is provided with a limiting groove used for containing thelimiting plate. And the limiting plate is in sliding connection with the limiting groove. The lead screw is arranged in the piston rod in a sleeved mode, the position of the lead screw in the cylinder body is changed by rotati