The utility model discloses an unmanned aerial vehicle for water sampling mainly includes unmanned aerial vehicle organism, navigation, driving system, sample thief, flow direction detection ware, flow speed detector, pollutant real -time detection ware, main control unit, data processor, the sample thief comprises thief hatch, thief hatch winding and unwinding devices, aqueduct, water sample collection device, vacuum pump, and the sample thief contains a plurality of water sample bottles, and unmanned aerial vehicle can once sample in every sampling department of layouting, and every water sample bottle is corresponding with corresponding sampling point to once only accomplish the water sampling that a plurality of samplings were layouted, high efficiency.