The invention discloses a washing machine inner and outer drum cleaning brush, which comprises a brush body and a fixed connection part connected with the brush body and a washing machine, wherein the fixed connection part comprises a washing machine inner and outer drum cleaning brush base and a switchable connection ring connected with the washing machine inner and outer drum cleaning brush base; the switchable connection ring at least has two concentric lantern rings, the inner lantern ring is fixed on the outside of the drum port of an inner drum of the washing machine, and the outer lantern ring is fixed on the inside of the drum port of an outer drum of the washing machine; cleaning brush connection holes are formed on the inner and outer lantern rings; and the cleaning brush can be detachably arranged in the cleaning brush connection hole of the inner or outer lantern ring through the base.