Embodiments of the invention disclose a strong magnetic electricity stealing monitor method and device and related equipment. The method comprises the steps of acquiring a sampling signal at the secondary side of a current transformer to carry out low-pass filtration; extracting a period midpoint of output waveforms of the current transformer; acquiring a first waveform data set of the first halfperiod and a second waveform data set of the second half period; comparing the data in the first waveform data set and the second waveform data set one by one, when the difference between the data isgreater than a preset value, considering that a strong magnetic electricity stealing condition exists, and calculating the stolen electricity through detecting the output current of the current transformer. According to the method, the waveforms of the first half period and the second half period are compared, judgement is carried out to determine whether the waveforms distort or not so as to judge whether strong magnetic electricity stealing behaviors exist or not, and when the electricity stealing behaviors exist, the stolen electricity is calculated, so that the problems that the strong magnetic electricity stealing cannot be efficiently judged and the stolen electricity cannot be calculated in the prior art are solved.