The invention relates to the technical field of unmanned aerial vehicles, in particular to a multi-purpose unmanned aerial vehicle for oil exploration. The multi-purpose unmanned aerial vehicle comprises an unmanned aerial vehicle body and a filming mechanism, and further comprises a liquid storing box, a fixed seat, a liquid pumping pump, a liquid draining pipe, an outer shield, a liquid outlet mechanism and a plugging mechanism. According to the multi-purpose unmanned aerial vehicle for the oil exploration, after the area where oil is located is determined, the marked liquid can be sprayed into an area which needs to be marked through the liquid outlet mechanism, the liquid draining pipe and the liquid pumping pump so that subsequent staff can quickly and intuitively find the area wherethe oil is located without completely relying on electronic equipment. The liquid outlet pipe is of a multi-section structure and is inclined upwards when not in use, lengthened pipes of each sectionare connected with each another in a sleeved mode and shrunk together, so that the land occupation area is reduced, and storing is convenient; and when liquid needs to be drained, the liquid outlet pipe can be rotated to the vertical state, the lengthened pipes of each section can be extended, so that the distance between the unmanned aerial vehicle and the ground is shortened, and the impact of wind on the liquid is reduced. Connecting is simple and convenient without manual operation.