Filtering system and filtering method

The invention discloses a filtering system and a filtering method, and relates to the technical field of quartz sand filtering, the filtering system comprises a desliming assembly, the desliming assembly comprises an inner hopper, an outer hopper and a stirring piece, the outer wall of the inner hopper and the inner wall of the outer hopper are spaced to form a containing cavity, the side wall of the inner hopper is provided with filtering holes, the filtering holes are communicated with the containing cavity, and the outer hopper is provided with a water outlet communicated with the containing cavity; the stirring part is located in the inner hopper and used for stirring the quartz sand in the inner hopper. The washing assembly is used for washing the quartz sand passing through the desliming assembly, the pickling assembly is used for pickling the quartz sand passing through the washing assembly, and the magnetic separation assembly is used for performing magnetic separation and impurity removal on the quar