Ag₂CO₃/AgBr/graphene oxide (Ag₂CO₃/AgBr/GO) ternary composites with different percentages of GO were fabricated by a facile co-precipitation strategy. The composites were characterized in the aspect of phase composition, light absorption performance, and micromorphology etc. The activity of the composites was studied by photocatalytic degradation of colored organic dye (rhodamine B, RhB) and colorless organics (phenol) under the shine of visible light. The optimized Ag₂CO₃/AgBr/GO-7.5 composites revealed the most excellent photocatalytic activity, which exhibited an apparent reaction rate constant exceeding that of pristine AgBr and Ag₂CO₃ by a factor of 107 and 5.63, respectively. The outstanding performance can be attributed to the effective separation of electrons and holes as well as the strong light absorption ability resulting from the Ag₂CO₃/AgBr/GO heterostructure. Moreover, it was verified that h⁺ and •O₂⁻ were two major active substances responsible for the decomposition of organic pollutants according to the free radical-trapping experiments. Besides, a probable reaction mechanism referring to the charge transfer and separation in the composites was proposed and discussed in detail.