Abstract: The present application discloses a water purifier, which comprises a composite water path structure; a filter cartridge; a universal direction water outlet structure; a housing; a sliding module; and a locking module; a plurality of flow meters; and a controller. The water purifier provided by the present invention has its water path structure, filter cartridge, water outlet structure, housing, way for replacing the filter cartridge as well as way for detecting service life of the filter cartridge improved, to obtain significantly improved working and using effects.