The utility model provides a safety protection system of terminal communication access network, it includes terminal layer, internet and uses the access layer, the terminal layer includes sub -station, power distribution terminal, wireless terminal, sensor terminal, power consumption terminal, intelligent terminal and masses terminal, the internet includes communication terminal, optic fibre private network, wireless public network, private network, power consumption terminal special channel, interactive gateway and internet, it includes that production control parentzone, management information parentzone, first safe access district, data isolation components, second safety insert the district and prevents hot wall to use the access layer, the first safe district that inserts is includingthe front -end processor, second safety inserts the district including safe access platform, the production control parentzone includes the private network front -end processor. The utility model discloses an encrypting and authenticating measure, one -way separation device and prevent measure such as hot wall and carry out safety protection to the access business of terminal communication accessnetwork guarantee that professional safety and stability inserts.