The invention relates to a power utilization characteristic spectrum analysis method for specific AC components. The method comprises that the sampling period is set as T second, the voltage and current of a power utilization device are sampled at the same time, and voltage and current sampling data at the same time is obtained; the number of the specific AC components is N, the frequency values of the AC components are f1, f2 to fN respectively, f1, f2 to fN are positive numbers that are increased progressively in order and not greater than 2pi/T, the DC components of the voltage and current as well as sine and cosine components of the AC voltage and current are directly obtained via a preestimation-correction algorithm; and amounts, including DC power as well as active power, reactive power, apparent power and the power factor of the AC component, reflecting the power utilization characteristic are calculated according to formulas. The method only includes arithmetic operation, is easy to program in computer, and has second-order precision and second-order convergence speed.