Abstract A series La-doped WO3/SrTiO3 heterojunctions photocatalyst were successfully prepared using solvothermal method. The as-fabricated heterostructures composite included La-doped WO3 fluff spheres tightly grew on the surface of SrTiO3 cubic particles. The crystallanity, structural, morphological and optical features of the catalysts were characterized using several techniques including XRD, XPS, SEM, TEM UV−vis and HRTEM. The photocatalytic activity of the heterojunction was evaluated by the photocatalytic degradation of methyl orange (MO) under visible-light irradiation. The influence of La doping and SrTiO3 molar ratio on heterojunctions photocatalysts was investigated. Among the as-prepared photocatalysts, the LWS50 sample exhibited the highest photocatalytic activity, almost 100% MO were completely decomposed within 75 min under visible light irradiation (λ > 420 nm). Compared with the pure WO3 and SrTiO3, the enhancement of photocatalytic activity was mainly attributed to the three-dimensional hierarchical structure and the effectively transfer and separation of photogenerated electron–hole pairs in La doped WO3 and SrTiO3 heterojunctions