Access authentication method, device and system for electric power 5G terminal

The invention belongs to the field of communication, and discloses an access authentication method, device and system for an electric power 5G terminal, and the method comprises the steps: a terminal management and control platform generates an adjustment amount and sends the adjustment amount to the electric power 5G terminal when a serial number of terminal equipment passes verification, updates an eSIM security chip identity authentication data hash value according to the adjustment amount, and obtains an updated eSIM security chip identity authentication data hash value; the electric power 5G terminal updates the identity authentication data hash value of the eSIM security chip according to the adjustment amount, obtains the updated identity authentication data hash value of the eSIM security chip, carries out partitioning processing, obtains a plurality of hash value blocks, and sends the hash value blocks to the terminal management and control platform; and the terminal management and control platform r