Coal mill hydraulic oil filtering device

The utility model relates to the technical field of coal mills, and particularly discloses a coal mill hydraulic oil filtering device which comprises an oil inlet pipe, an oil outlet pipe and at least two filters arranged between the oil inlet pipe and the oil outlet pipe in parallel, the filter comprises a shell, a filter cartridge arranged in the shell, a brush plate assembly brushing along the surface of the filter cartridge and a power assembly driving the brush plate assembly to brush, a first containing cavity communicated with the oil inlet pipe is formed between the shell and the outer surface of the filter cartridge, and a second containing cavity communicated with the oil outlet pipe is formed in the filter cartridge; the multiple filters are arranged, so that when one filter is used for cleaning impurities, other filters can be used for filtering hydraulic oil, and by arranging the brush plate assembly and the power assembly, the filter can clean impurities on the surface of the filter cartridge ev