Filtering system and machine tool

The invention provides a filtering system and a machine tool. The filtering system comprises a water inlet assembly, a box body, a filtering assembly and a water outlet assembly, wherein a first cavity is formed in the box body, and the filtering assembly is arranged in the first cavity; the water inlet assembly comprises a water inlet pipe, to-be-filtered liquid enters the filtering system through the first end of the water inlet pipe, and the second end of the water inlet pipe is communicated with the first cavity and is located above the filtering assembly; and the water outlet assembly comprises a water outlet pipe, the first end of the water outlet pipe is communicated with the first cavity and is located below the filtering assembly, and the second end of the water outlet pipe is used for discharging filtered liquid. In the embodiment of the invention, the to-be-filtered liquid enters the filtering system through the first end of the water inlet pipe, is filtered by the filtering assembly and then is di