Filter

The filter comprises a shell and a filter element, the filter element is arranged in the shell, the filter element comprises a first end cover, a second end cover and a filter material, the first end cover and the second end cover are arranged at the two ends of the filter material, the filter material comprises a filter column, the filter column is formed by winding the filter material, and a fluid channel is formed in the middle of the filter column. The first end cover is provided with a first annular groove, the second end cover is provided with a second annular groove, the two ends of the filter column are clamped in the first annular groove and the second annular groove, a water outlet of the first end cover is communicated with the fluid channel, a mounting hole is formed in the bottom of the second end cover, and the mounting hole corresponds to a mounting seat in the shell. According to the filter disclosed by the utility model, multi-layer filtration of the filter element can be realized, the filter