In recent times, the nanostructured materials of foreign metal ion doped ZnO photocatalysts acts as a hotspot in the research area of photocatalysis because of its non-toxic, cost-effective and environmental friendly behaviour. Sr-doped ZnO microspheres were synthesized by the hydrothermal method. In foreign metal ion-doped ZnO photocatalysts, Sr ions are uniformly distributed into ZnO lattice, which reflects the enhancement in the light absorption behaviour. Especially, 5% Sr-doped ZnO shifts the bandgap to visible region up to 422 nm. Sunlight-driven photocatalytic activity revealed that Sr (5%)-doped ZnO shows maximum degradation efficiency of 99%, 90%, and 93% on methylene blue, Rhodamine B, and ciprofloxacin, respectively. Further, the possible degradation mechanism was well-discussed with the help of the elemental trapping test.