The invention relates to cylinder inner wall cleaning equipment. The cylinder inner wall cleaning equipment comprises a friction cleaning device with rotating axis extending in the front-back direction, and a driving piece for driving the friction cleaning device to rotate. The cylinder inner wall cleaning equipment further comprises a walking car for walking in a corresponding cylinder to drive the friction cleaning device to clean the inner wall of the cylinder from back to front; the walking car includes at least one walking wheel pair; and the walking wheel pairs include left and right walking wheels symmetrically arranged left and right. The walking car drives the friction cleaning device to clean the inner wall of the cylinder in the inner wall of the cylinder from back to front. The left and right walking wheels have spherical wheel surfaces contacted, rolled and matched with surfaces matched with the inner wall of the cylinder or conical wheel surfaces in linear contact, rolling and matching, so that smooth walking of the walking car in the inner wall of the cylinder can be guaranteed without generating such conditions as rotating slip or blockage stop.