Cleaning brush convenient for adding cleaning liquid

The utility model discloses a cleaning brush convenient for adding cleaning liquid. The cleaning brush comprises a handheld part, a brush rod, a liquid storage tank and a brush head with bristles on the periphery, a baffle with a hole in the center is arranged at the top end of the handheld part; a supporting plate with a hole in the center is fixedly arranged on the inner wall of the upper part of the handheld part; the connecting rod penetrates through the openings of the baffle and the supporting plate; a push plate is arranged at the top of the connecting rod; the push plate is positionedabove the baffle; a positioning plate is arranged on the upper portion of the connecting rod and located between the baffle and the supporting plate, a piston is fixed to the bottom end of the connecting rod, one end of a spring is fixed to the piston, the other end of the spring is fixed to the lower end of the supporting plate, the lower side wall of the handheld part is connected with the otherend of the communicating