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The development of an efficient photocatalyst with superior activity under visible light has been regarded as a significant strategy for pollutant degradation and environmental remediation. Herein, a series of WO 3 /Ag 2 CO 3 mixed photocatalysts with different proportions were prepared by a simple mixing method and characterized by XRD, SEM, TEM, XPS, and DRS techniques. The photocatalytic performance of the WO 3 / Ag 2 CO 3 mixed photocatalyst was investigated by the degradation of rhodamine B (RhB) under visible light irradiation (λ > 400 nm). The photocatalytic efficiency of the mixed WO 3 /Ag 2 CO 3 photocatalyst was rapidly increased with the proportion of Ag 2 CO 3 up to 5%. The degradation percentage of RhB by WO 3 /Ag 2 CO 3 −5% reached 99.7% within 8 min. The pseudo-first-order reaction rate constant of WO 3 /Ag 2 CO 3 −5% (0.9591 min −1 ) was 118-and 14-fold higher than those of WO 3 (0.0081 min −1 ) and Ag 2 CO 3 (0.0663 min −1 ). The catalytic activities of the mixed photocatalysts are not only higher than those of the WO 3 and Ag 2 CO 3 but also higher than that of the WO 3 /Ag 2 CO 3 composite prepared by the precipitation method. The activity enhancement may be because of the easier separation of photogenerated electron−hole pairs. The photocatalytic mechanism was investigated by free radical capture performance and fluorescence measurement. It was found that light-induced holes (h + ) was the major active species and superoxide radicals (•O 2 − ) also played a certain role in photocatalytic degradation of RhB.