The present invention discloses an ATM networking controller, including: an external interfaces and an internal interface; an Interface Processing Module for processing network transmission services and implementing the uplink/downlink transmission of local services and the transparent transmission of non-local services; an OAM Processing Module for implementing automatic topology management and data configuration synchronization through OAM information elements; a Switching and Scheduling Processing Module for scheduling the interconnection services and guaranteeing the QoS thereof; and a Routing or Protection Switching Module for switching a path, implementing self-healing recovery of services, detecting failures, and conducting the corresponding switching protection. An ATM device and an ATM communication network system are disclosed by the present invention as well. According to this invention, various networking modes can be implemented flexibly, maintenance of the network is more convenient, and the efficiency and reliability of the network is guaranteed.