Color is the most significant identified contaminant amongst all kinds of pollutants in wastewaters, which is used in various industries and is demonstrated to be risk on human beings and environment. Hence, alpha-Fe2O3 immobilized Ag2CO3 (Ag2CO3/alpha-Fe2O3) photocatalyst was successfully synthesized by a facile ultrasonic precipitation strategy to obliterate dyes in water. The physicochemical properties (PECH) of as-constructed Ag2CO3/alpha-Fe2O3 heterojunction were confirmed by series of measurements. Results indicated that Ag element was successfully deposited onto the surface of alpha-Fe2O3 substrate, in which existed in the forms of Ag2CO3 species. Besides, we investigated photoelectrochemical properties of Ag2CO3/alpha-Fe2O3 to confirm the formation of heterojunction between Ag2CO3 and alpha-Fe2O3. As a result, Ag2CO3/alpha-Fe2O3 exhibited high interfacial electron transport and photocatalytic (PC) performance. Meanwhile, Ag2CO3/alpha-Fe2O3 could degrade four kinds of dyes in water under visible light illumination. Moreover, the photocatalytic performance mechanism of Ag2CO3/alpha-Fe2O3 heterojunction was proposed reasonably. Therefore, this study provides a new insight into photocatalyst for applications in Ag-based solar photocatalysis to eliminate environmental contaminants.