The invention discloses a roller for a water-based paint. The roller comprises
brush bristles, wherein a paint storage roller is arranged in the
brush bristles, a cavity is formed in the paint storageroller, a supporting shaft hole is formed in the center of the paint storage roller, a supporting shaft rod is rotatably plugged and connected in the supporting shaft hole, one end of the supportingshaft rod is downward bent to be connected with one end of a
handle, an arc-shaped groove is formed in the inner wall of the upper side of the paint storage roller, material leaking holes are formed in the side wall of the paint storage roller outside the arc-shaped groove, an arc-shaped clamping plate is connected to the inner wall of the lower side of the paint storage roller through a spring, amagnet is arranged on the lower end face of the arc-shaped clamping plate, and an
electromagnet is arranged on the inner wall of the lower side of the paint storage roller. The roller for the water-based paint is reasonable in structure and good in practicability, the paint storage roller can store coatings, dipping times are decreased,
coating dropping is decreased, opening and closing of the arc-shaped clamping plate can be controlled by arranging the
electromagnet and
magnet, discharging of the paint in the paint storage roller is controlled, the roller is very convenient, and high positions of wall faces or ceilings can be coated by arranging an lengthened rod.