The utility model provides an unmanned aerial vehicle-mounted corona discharge broadband spectrum detection device. Unmanned aerial vehicle, a detection box is carried on the unmanned aerial vehicle;an ultraviolet sensor and a detection antenna are arranged on the detection box; an ultraviolet signal processing circuit, an antenna signal acquisition circuit, an antenna signal processing circuit,a power supply module, a processor and a communication module are arranged in the detection box; wherein the ultraviolet sensor is connected with the ultraviolet signal processing circuit, the detection antenna is connected with the antenna signal acquisition circuit, the antenna signal acquisition circuit is connected with the antenna signal processing circuit, and the ultraviolet signal processing circuit, the antenna signal processing circuit, the power supply module and the communication module are all connected with the processor. According to the utility model, the ultraviolet spectrum and the radio frequency spectrum in the corona discharge signal are jointly detected, so that the detection sensitivity of the corona discharge point is improved, and meanwhile, the corona discharge degree is correctly evaluated by counting and analyzing the radio frequency spectrum signal and the number of ultraviolet pulses.