The invention discloses an unmanned aerial vehicle electricity testing device for a distribution overhead line, and aims to provide the unmanned aerial vehicle electricity testing device which not only can reduce the labor intensity of electricity testing of the distribution overhead line, but also can ensure the safety and reliability of the electricity testing; the unmanned aerial vehicle electricity testing device can effectively solve the problem that the unmanned aerial vehicle is unbalanced due to external force interference in the contact process of the unmanned aerial vehicle electricity testing device with the distribution overhead line. The unmanned aerial vehicle electricity testing device comprises an unmanned aerial vehicle, wherein the middle part of a frame of the unmanned aerial vehicle is provided with a ball head hole with openings at the upper end and the lower end; an insulating rod, which penetrates through the ball head hole; the upper end of the insulating rod ispositioned above the frame, the lower end of the insulating rod is positioned below the frame, the middle part of the insulating rod is provided with a ball head which is rotationally matched with the ball head hole, the insulating rod is rotationally arranged on the ball head hole of the frame through the ball head, and a balance ball is arranged on the insulating rod and positioned below the frame; an electricity testing assembly, wherein the electricity testing assembly comprises an electricity testing probe arranged on the upper end and/or the lower end of the insulating rod.