The invention discloses a novel roller brush which comprises a roller brush head (1), a connecting rod (2) and a handle (3). A receiving device (4) is arranged on the connecting rod (2) and positioned below the roller brush head (1), a plurality of evenly distributed discharge ports (5) are arranged on the outer annular wall of the roller brush head (1), a feed cap (6) is arranged on one side of the roller brush head (1), a mounting cavity (7) is arranged on the other side of the roller brush head (1), a clamping groove connector (8) is arranged in the mounting cavity (7), and the connecting rod (2) is connected with the roller brush head (1) through the clamping groove connector (8). Coating can be contained inside the roller brush head, repeated dipping is not needed, labor force is saved, leakage is avoided, waste is reduced, and the dropped coating can be received for recycle as the receiving device is arranged below the roller brush. Besides, the novel roller brush is convenient to mount and demount and simple in structure and has excellent application prospect.