The invention discloses a method for removing antibiotics from a water body by using a copper sulfide/bismuth vanadate heterojunction photocatalyst. The method treats the antibiotics in the water bodyby using the copper sulfide/bismuth vanadate heterojunction photocatalyst, wherein the copper sulfide/bismuth vanadate heterojunction photocatalyst comprises copper sulfide and bismuth vanadate, andthe copper sulfide is attached to the bismuth vanadate. The method can be carried out at normal temperature under normal pressure, can mineralize the antibiotics (such as ciprofloxacin) into water andcarbon dioxide, can effectively perform solid-liquid separation without secondary pollution, has the advantages of simple operation, no need for large equipment, low cost, wide application range, high treatment efficiency, good treatment effect, strong reusability and environmental friendliness, can efficiently degrade the antibiotics in the water body, and has good application value and application prospect.