The embodiment of the invention discloses a method, a device and a system for managing a user terminal equipment region, relating to the technical field of communication and aiming at realizing the regional fine management of an operator for user terminal equipment. The method includes the following steps: a business operation supporting system divides the region of the operator into subregions representing each community, and sends feedback about a serial number of the stored user terminal equipment and information of the divided subregions to an ITMS (integrated terminal management system);the ITMS configures the serial number of the user terminal equipment into the corresponding subregion, and sends a network domain name corresponding to the subregion to the user terminal equipment when the user terminal equipment is in registration; the user terminal equipment writes the network domain name corresponding to the subregion into a read-only storage chip, intercepts and captures an account number used by a user when in PPPoE dialing, adds the network domain name to generate a complete account number, and then sends the complete account number to local side equipment of the operator to carry out network authentication.