The invention provides an extraction method, device and equipment for an effective value of a waveform, and a storage medium. The method includes the following steps: a specified waveform capable of reflecting a change condition of a value of a specified parameter with time is obtained; a variance for the specified waveform is calculated in a segmented manner to obtain a variance distribution sequence corresponding to the specified waveform, wherein one variance in the variance distribution sequence corresponding to the specified waveform corresponds to a waveform segment of the specified waveform; and the effective value of the specified waveform is determined based on the variance distribution sequence corresponding to the specified waveform. The extraction method of the effective valueof the waveform provided by the invention can automatically extract the effective value of the specified waveform, compared with a manual extraction method, enables the labor cost and the time cost tobe reduced, avoids the influence of subjective factors on an extraction result, and enables a degree of accuracy of extraction of the effective value of the waveform to be improved.