The invention discloses an electricity larceny prevention simulation monitoring method for a re-electrified energy consumption device. The method comprises the following steps: analyzing a terminal power consumption mode of each re-electrified energy consumption device, extracting electrical characteristic parameters, establishing a power consumption load model, and carrying out clustering analysis on the terminal power consumption modes by adopting a fuzzy C-means clustering algorithm to obtain power consumption load characteristics of each re-electrified energy consumption device; analyzingan electricity stealing mechanism in the industry of the re-electrified energy consumption device, and constructing a full-class electricity stealing mode knowledge base; building an electricity larceny prevention all-factor test platform, metering forms and collection modes of various types of re-electrified energy terminals are simulated, and laboratory reproduction of the re-electrified energyconsumption device and various types of electricity stealing modes is achieved. Correspondingly, the invention further discloses a system, a medium and equipment corresponding to the method. The method, the system, the equipment and the medium have the advantages of accurately simulating various user electricity stealing modes, accurately reproducing abnormal events and the like.