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Performance improvement of Pulse Width Modulation (PWM) rectifier brings about a complicated structure, which makes the reliable operation face higher demand increasingly. Therefore, this paper proposes a new method of fault feature extraction based on LMD and weighted frequency range energy operator. This method unfolds the energy distribution of the fault signal in term of frequency through decomposing it into amplitude and frequency modulated signals. Then the feature vector can be constructed accord to the energy distribution and the correlation between each product function and the fault signal. Finally, the three-phase three-level 380V PWM rectifier is utilized as an example,fault injected on 0.1 s of 0.5 s simulation time. And the simulation results show that the proposed approach can catch the fault feature sensitively, while achieving dimension reduction of feature vector.