Provided is a roller blind device for an automobile sunroof, comprising a roller blind cloth (1), a winding guide assembly (2) and a guide rail (3). The winding guide assembly (2) comprises a guide passageway (202) having a deformation part (203). The deformation part (203) can guide and deform a reinforcing band (101) on two sides of the roller blind cloth (1) before it enters a matching rail, and can flip the reinforcing band (101) or separate it from the bottom roller blind cloth (1), thus preventing a situation whereby sliding in the guide rail is not smooth and the strength of the cloth in the fringe area of the roller blind cloth is not enough, leading to pulling not being smooth and even deformation and tearing after long-term use.