Cutting fluid filtering device

The invention relates to the technical field of mechanical machine tools, in particular to a cutting fluid filtering device. The device comprises a solid-liquid separation assembly and an oil-water separation assembly which are communicated through a transfer assembly, the solid-liquid separation assembly comprises a filter tank and grid plates, a group of U-shaped mounting plates are sequentially arranged on the tank wall of the filter tank in the direction from the input end to the output end, and the grid plates are detachably and hermetically arranged on the U-shaped mounting plates; the grid plates are arranged in the filter tank, the filtering grades of the grid plates in the direction from the input end to the output end of the filter tank are sequentially increased, a groove is formed in the tank bottom of the output end of the filter tank, a water drainage plate is detachably arranged at a groove opening of the groove, the oil-water separation assembly comprises a conical filter cartridge and an oil