The invention discloses a preparation method for a visible-light-responsive fluorinated graphene (FG) composite catalyst. The preparation method comprises the following steps: subjecting graphene oxide to a hydrothermal reaction so as to prepare FG; then subjecting FG, bismuth nitrate and zinc nitrate to a solvothermal reaction so as to produce a FG-ZnBi2O4 compound; and reacting the FG-ZnBi2O4 compound with tetrabutyl titanate so as to prepare a TiO2-FG-ZnBi2O4 compound, i.e., the visible-light-responsive fluorinated graphene composite catalyst. The visible-light-responsive fluorinated graphene composite catalyst prepared in the invention has good catalytic activity and stability in degradation of organic pollutants in environment under visible-light response conditions, and is repeatedly usable and friendly to environment.