Air cylinder or oil cylinder capable of adjusting needle position

The utility model discloses an air cylinder or oil cylinder capable of adjusting the position of a valve needle, and relates to the technical field of air cylinders or oil cylinders. The valve comprises a cylinder body assembly with an inner cavity, a piston in sliding fit with the inner cavity, an adjusting rod and a valve needle, wherein the adjusting rod and the valve needle are arranged in the piston; the adjusting rod, the valve needle and the piston are in threaded connection, a spring is arranged in the adjusting rod and the piston, and a check ring is arranged on the piston. The piston and the adjusting rod are arranged in the cylinder body assembly, so that a user can conveniently adjust the position of the adjusting rod in the piston, the extending length of the valve needle is adjusted, on one hand, the problem that the product quality is affected due to the fact that the valve needle is too long or too short can be solved, on the other hand, the valve needle damaged due to the length problem is re