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In this study, n‐type SnO2 was synthesized and modified with p‐type NiWO4 to create a new NiWO4/SnO2 p–n heterojunction photocatalyst for effective organic dye degradation (Amaranth). X‐ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–Vis diffuse reflection spectroscopy (DRS), and Brunauer–Emmett–Teller (BET) surface area analysis were all used to evaluate the synthesized materials. Through its internal electric field and strong driving force, the composite photocatalyst with p–n heterojunction considerably enhances charge generation and suppresses photogenerated electron–hole recombination, which would be beneficial to boost their photocatalytic performance. At 180 min, the NiWO4/SnO2 photocatalyst had the maximum efficiency for degrading Amaranth, up to 93%. Finally, the experimental results were used to rationally analyze the photodegradation mechanism.