Abstract: As the basic component of the energy Internet sensing layer, power sensor has attracted attentions from practitioners with focus on its power supply stability. Environmental energy harvesting technology makes the power sensor have self-powered capability and long-term maintenance-free advantages, and its application in power sensors has thus attracted more and more attentions. A review is made of the application status of environmental energy harvesting technologies in the field of electric power, as well as the characteristics of new energy harvesting technologies such as temperature difference, vibration, wind-induced vibration, etc.. Based on the application requirements of power sensors, the development trend of environmental energy harvesting technologies is predicted for their application in electric power industry, which can be summarized as diversification of energy harvesting methods, miniaturization of energy harvesting devices, integration of energy harvesting devices and sensors. In addition, a systematic analysis is made on the technical challenges, reliability challenges and application adaptation challenges in application of the energy harvesting technologies to the power sensor field.