Return oil filter

One end of an installation cylinder is fixedly connected with an installation plate used for installing the whole oil return filter on a machine, an oil inlet pipe head is arranged on one side of one end of a filter cylinder in a sealed and penetrating mode, an oil outlet pipe head is arranged on the other side of one end of the filter cylinder in a sealed and penetrating mode, and the oil inlet pipe head and the oil outlet pipe head are symmetrical to each other. J-shaped clamping grooves matched with the oil inlet pipe head and the oil outlet pipe head in a clamping mode are formed in the two sides of the other end of the installation cylinder correspondingly, a sealing base is installed at the end of the filter cylinder in a butt joint mode, the sealing base is in butt joint with the filter cylinder through a first pipe sleeve, the middle of the filter cylinder is sleeved with a filter screen cylinder, and a second transmission rod is arranged at the axis of the filter screen cylinder; a plurality of clean