The invention discloses an arc-shaped roller brush with the adjustable curvature radius. The arc-shaped roller brush comprises a brush rod. A mounting hole is formed in the lower end inside the brushrod and internally provided with a processor and multiple sections of batteries. A large sliding groove is formed in the upper end of the side face of the brush rod, a small sliding groove is formed in the inner wall of the large sliding groove, and a large sliding block is slidably mounted in the large sliding groove. The arc-shaped roller brush has the beneficial effects of being capable of brushing various curved surfaces with the different diameters, rich in function, easy and convenient to operate, capable of saving the time and labor and good in practicability.