The invention discloses an unmanned aerial vehicle radio frequency signal power multi-channel parallel detection device which comprises a radio frequency signal receiving module, a signal amplifier module, a channel division module, a power detection module and a microcontroller module. The radio frequency signal receiving module receives a radio frequency signal of the unmanned aerial vehicle remote controller and performs down-conversion; the signal amplifier module carries out high-gain amplification on the obtained baseband signal; the channel division module selects and divides a plurality of channels on a specific frequency band according to a frequency hopping rule of unmanned aerial vehicle remote controller signals; the power detection module converts the signal power on each channel into a voltage form and outputs the voltage form; and the microcontroller module controls the gain of the signal amplifier module and performs digital-to-analog conversion and conversion on the voltage value output by the power detection module so as to obtain a digitalized unmanned aerial vehicle signal power value. The method can effectively extract the information provided by the frequencyhopping characteristic of the unmanned aerial vehicle signal, and has the advantages of low cost, convenience in deployment, simplicity in operation and strong anti-interference capability.