▎ 摘　　要

NOVELTY - The cleaning device comprises a shell (10) that is used for storing cleaning liquid. A self-cleaning assembly (20) is movably connected to the inner wall of the shell so as to clean the inner wall of the shell and/or the cleaning liquid when moving in the shell. The self-cleaning assembly includes a first cleaning assembly. The first cleaning assembly includes multiple supporting pieces (211). The first cleaning assembly includes a first filter plate (2121), a second filter plate (2122) and a third filter plate (2123). The first filter plate includes high-aggregate molecular material. The second filter plate includes weak magnetic metal or material graphene. The third filter plate includes a variable-diameter porous polymer. The second filter plate includes macromolecule synthetic plastic or porous foam material. USE - Cleaning device for cleaning of foreign matter in an inner wall of a cleaning tank. ADVANTAGE - The cleaning device improves the cleaning effect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a cleaning method. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a cleaning device. Shell (10) Bottom wall (12) Movable self-cleaning assembly (20) Supporting piece (211) First filter plate (2121) Second filter plate (2122) Second filter plate (2123)