The invention discloses an electric energy metering method based on Kaiser window FFT four-peak interpolation. The electric energy metering method comprises steps that based on a Kaiser window FFT four-peak interpolation modification formula, FFT frequency shift, and frequency spectrum of a window function Kaiser, amplitudes of symmetrical spectral lines on left sides and right sides of fundamental wave, harmonic wave, and interharmonic wave peak value frequency points are acquired, and by using a polynomial fitting formula, the general amplitude, phase, and frequency interpolation modification formula of the signal fundamental waves, the harmonic waves, and the interharmonic waves is acquired; according to the general amplitude, phase, and frequency interpolation modification formula, the amplitude parameters, the phase parameters, and the frequency parameters of the fundamental waves, the harmonic waves, and the interharmonic waves of measured voltage signals and measured current signals are calculated; fundamental wave electric energy, harmonic wave electric energy, interharmonic wave electric energy, and total electric energy are calculated. The electric energy metering method is advantageous in that according to a four-peak interpolation modulation algorithm, by fully using the symmetrical performance of the left and right four spectral lines of the amplitude frequency points and the main lobe performance and the side lobe performance of the Kaiser window function, high calculation accuracy is provided.