The cylindrical lead screw protective cover can effectively protect the oil cylinder, cylinder, piston rod, lead screw, light bar, shaft, column and other parts from dust and other special pollution and damage, and can be extended or compressed with the parts. It can be used vertically or horizontally. When using horizontally, it is recommended to use a plastic or aluminum support ring to keep a certain uniform distance between the inner cavity of the protective sleeve and the oil cylinder to extend the service life.