The utility model discloses a public communication access device that bears towards multi -service, include the terminal of inserting production control parentzone and management information parentzone through wired private network, and insert each access terminal and the equipment of management information parentzone information intranet through wireless public network and electric power privatenetwork, still including inserting the unit through light terminal equipment OLT through safety respectively with each terminal and equipment, or industrial ethernet, or private network inserts wiredprivate network, multi -service communication access gateway is connected to wired private network, production control parentzone and management information parentzone information intranet link to each other with multi -service communication access gateway through the filtration ion exchange assembly of different parentzones respectively. The utility model discloses carry out reinforcement designto multi -service communication access gateway and the safe security function that inserts the unit, make it by original " gateway the gateway " do the safety of mode encrypt the tunnel and refines to " business professional " safety encrypt the tunnel.