Method and device for controlling access capability of illegal manufacturer ONU in GPON system

The invention discloses a method and device for controlling the access capability of an illegal manufacturer ONU in a GPON system. The method comprises the following steps that an OLT establishes a characteristic value check list according to the capability feature value of a legal manufacturer ONU; a limitation strategy of the illegal manufacturer ONU is set; whether the ONU is an illegal manufacturer ONU or not is determined by the OLT according to the ONU capability characteristic value reported in the ONU authentication process, if yes, the OLT controls the access capability of the ONU according to the limitation strategy of the illegal manufacturer ONU, and if not, ONU authentication activation is successful, and the access capability is normal and is not limited. By means of the method and device, the safety protection function of the OLT device is greatly improved, and the safety of GPON system running is enhanced.