The present invention discloses a GPS deception detection method for an electric patrol unmanned aerial vehicle. The method comprises a step 1, a GPS module of the unmanned aerial vehicle obtains the signal intensity of a currently observed GPS satellite; a step 2, a distance between each GPS satellite and the unmanned aerial vehicle is calculated; a step 3, the observation angle of the present each GPS satellite relative to the horizontal plane wherein the unmanned aerial vehicle is located is calculated; a step 4, if the observation angle value is less than 0, there is a GPS attack in a preset area, and a GPS alarm is emitted, otherwise, according to the elevation mask angle, satellite signals that are not easily blocked are selected; a step 5, the maximum signal strength of the GPS signal is calculated according to the distance and position relation between each GPS satellite and the unmanned aerial vehicle; and a step 6, when the signal strength of the current GPS satellite is detected to exceed the maximum signal strength of the GPS satellite, a GPS attack exists in the preset area. The method can quickly detect GPS deception with low power consumption and low cost.