The invention relates to an electrical energy measuring transformer simulation training and examination device and system based on Internet. The device comprises an operating platform, and further comprises a simulation standard transformer arranged in the operating platform as well as a simulation tested transformer, standard transformer binding posts, tested transformer binding posts, relays and a singlechip arranged on the surface of the operating platform. According to real transformer equipment on site, the voltage level is reduced, and the simulation training device and system are developed. Under the simulation site environment, simulation training of transformer site detection wire connection and calibration is realized, and new thoughts and paths are provided for training and examination of transformer detection personnel. In the simulation state, personnel and equipment are mostly safe in the training process, trainees easily master skills, the teaching effect is easily supervised and checked, the trainees can learn and master multiple error features of mis-wiring of transformers under the safe voltage level, and judgment and analysis in practice are facilitated.