Abstract: With the construction of the power Internet of things, the power Internet of things platform is facing the challenge of massive heterogeneous terminal access and the pressure of explosive growth of data. Therefore, this paper is oriented to the massive terminal access technology of the power Internet of things and discusses the current issues faced by the power Internet of things terminal access in the perception layer, network layer, platform layer and application layer. The research review of terminal access technology is carried out from four aspects of information perception, network transmission, and real-time computing, security and protection. At the perception layer, due to the key role of power Internet of things information perception, the information perception technology system and related terminal access algorithms are studied. At the network layer, the power Internet of things generates a large amount of data traffic, and information interaction faces challenges. The technology of power communication network is explored from two aspects: software definition network, data transmission and traffic optimization. At the platform layer and application layer, to solve the current real-time computing problems of the power Internet of things, edge computing technology is introduced to relieve the pressure of cloud computing, and the current computing offloading algorithm is introduced in detail. Finally, the security protection-related technologies of terminal access are analyzed and summarized.