Full-automatic filter

The utility model discloses a full-automatic filter which comprises a filter body, a primary filter is arranged on the inner wall of the filter body, a water inlet pipe is designed at the upper end of the primary filter, a secondary filter cartridge is arranged below the primary filter, and the upper end and the lower end of the secondary filter cartridge are communicated with water conveying pipes. The upper water conveying pipe is communicated with the lower end of the primary filter, the lower water conveying pipe penetrates and extends to the bottom of the filter body, two clamping rings are fixedly connected to the side wall of the secondary filter cylinder, and positioning devices are fixedly connected to the inner walls, corresponding to the two clamping rings, in the filter body; connecting devices are arranged on the other sides of the two clamping rings, and the secondary filter cartridge is designed to be in a hollow cylinder shape. The water purifier is reasonable in structural design, and has the