The invention relates to a roller
brush which comprises a roller structure, a mounting bracket and a
flow diversion pipe. The roller structure is used for mounting and supporting a brushing fabric; aplurality of
slurry-permeating holes are formed in the roller structure; the mounting bracket at least comprises a
handle, a first supporting part and a second supporting part; the
flow diversion pipeis used for mounting the roller structure; the two ends of the
flow diversion pipe are separately fixed through the first supporting part and the second supporting part; a first cavity is formed in the middle of the flow diversion
pipe; an opening in one axial end communicates with the outside;
coating is supplemented by means of the opening; after the
coating is supplemented, the opening is plugged by a seal cover; a
slurry outlet hole is formed in the side wall of the first cavity, and is used for communicating the first cavity with a second cavity between the flow diversion pipe and the roller structure; and the
coating flowing in the second cavity from the first cavity flows out from the
slurry-permeating hole. The roller
brush is simple in structure and convenient to operate, and slurry is poured in the flow diversion pipe to realize
self supply of the coating in brushing conveniently, so that the long-time coating brushing is ensured, the brushing efficiency is improved, and theoperation difficulty is reduced.