Brush capable of being rapidly disassembled and assembled and cleaning machine

The utility model discloses a quick disassembly and assembly brush which comprises a connecting shaft, the outer side of the connecting shaft is connected with a shell assembly, the shell assembly comprises a split type shell, a positioning groove is formed in the side, away from the connecting shaft, of the split type shell in the axial direction, a brush assembly is embedded in the positioning groove, and the brush assembly is connected with the split type shell. The split type shells are provided with elastic buckles and clamping grooves, the two split type shells are connected in a matched mode through the corresponding elastic buckles and the clamping grooves to form a shell assembly, positioning columns are arranged on the inner sides, close to the connecting shaft, of the split type shells, and connecting holes matched with the positioning columns are formed in the connecting shaft. The positioning column extends into the connecting hole so that the split type shell can be fixedly connected with the co