The invention discloses an energy detection method based on a double-threshold power spectrum double-average ratio, and relates to the technical field of cognitive radio, and the method comprises thesteps: 1, calculating double thresholds and a detection statistics TDTED under double-threshold energy detection, judging whether the detection statistics TDTED is greater than a lower threshold gamma0 and less than an upper threshold gamma 1 or not, and if not, executing the step 2; if so, executing the step 3; 2, judging whether the detection statistics TDTED is greater than or equal to an upper threshold gamma 1 or not, if so, determining that the PU signal exists, and if not, determining that the detection statistics TDTED is less than a lower threshold gamma 0, and determining that the PU signal does not exist; 3, calculating the maximum value and the minimum value of the power spectrum, the test statistics TDPSRA and the threshold value gamma DPSRA by adopting a power spectrum double average ratio algorithm; and 4, judging whether the test statistics TDPSRA is greater than or equal to a threshold gamma DPSRA, if so, determining that the PU signal exists, and if not, determiningthat the PU signal does not exist. According to the invention, another detection algorithm for processing is added between double thresholds, so that the processing efficiency of the algorithm is improved, and the detection performance of energy detection can be remarkably improved.