A roller skate shoe has cavities, closing members and roller assemblies. A sole of the shoe is formed with the cavities. Two sides of each cavity are formed with notched slots. The closing member is accommodated in the cavity. The closing member has a closing side for closing the cavity, and is formed with two cut edges corresponding to the notched slots. The roller assembly mounted on the closing member includes a roller base, a roller body mounted in the roller base, and two control assemblies respectively mounted to two sides of the roller base corresponding to the cut edges and the notched slots. The roller assembly is separated from the cavity using the control assembly so that the closing member may be detached from the roller and reversed to close the cavity to prevent foreign objects from entering the cavity.