The invention relates to an overflow type filtering structure for machine tool cutting fluid. The overflow type filtering structure comprises a filter cartridge, L-shaped scraper blades and a hair brush, wherein the filter cartridge is of a cuboid structure, the interior of the filter cartridge is hollow, the left end and the right end of the filter cartridge are closed through thin plates, a closed thin plate is arranged at the upper part of the filter cartridge, a wedge-shaped gap plate is arranged at the lower part of the filter cartridge, the front side and the rear side of the filter cartridge are in an open state, thin plates are arranged at the front end and the rear end of the filter cartridge, and connecting holes are respectively formed in the thin plates at the front end and the rear end of the filter cartridge; the L-shaped scraper blades are respectively positioned on the upper surface and the lower surface of the filter cartridge. Through the technical scheme, the overflow type filtering structure has the beneficial effects that the wedge-shaped gap plate is matched with the hair brush, the overflow type filtering structure is simple in structure and convenient to maintain, and the stainless steel hair brush can be used for automatically cleaning the gap plate; compared with an ordinary gap plate structure of a traditional mesh filtering machine, the blockage of the gap plate is effectively prevented, and the filtering precision is improved; the equipment cost and occupied area are greatly reduced.