The invention relates to a roller brush, comprising a roller frame, a roller shell, and a sponge cover. The roller shell is covered with a sponge cover. Both ends of the roller shell are assembled on the roller frame. One end of the roller shell is closed, and the other One end is open, and an end cover is provided at the opening end of the drum shell, and several discharge components are installed on the drum shell; paint is poured into the drum shell, and when it is not rolling on the wall, under the elastic force of the elastic member, The rubber cover closes the hole on the roller shell, and the paint cannot flow out or drip in the roller shell; when painting, the roller rolls along the wall, and under the action of pressure, the pressure plate links the connecting rod to open the rubber cover and paint It flows out from the hole on the discharge assembly, penetrates into the sponge sleeve, and is painted on the wall; this setting overcomes the problem of paint dripping when painting paint, avoids later cleaning, and reduces frequent dipping by ordinary rollers The disadvantages of paint improve work efficiency and reduce labor intensity.