The invention discloses an NB-IoT-based intelligent electric meter power failure fault processing device and method. The method comprises the steps of receiving a power failure report request sent bya power failure intelligent electric meter; inquiring and obtaining the current power failure information and the current position information of each power failure intelligent electric meter one by one; judging a non-fault area range and a fault area range of the power distribution and utilization system on the basis of the corresponding topological structure of the power distribution and utilization system and the current power failure information and the current position information of the intelligent electric meter in each power failure; and carrying out the corresponding fault processingactions according to the non-fault region range and the fault region range. According to the invention, the power failure conditions of users can be reported rapidly, at the same time, the reported power failure range and the current information before power failure can be analyzed, the power failure range and the non-fault area range are rapidly positioned, the maintenance personnel are guided torapidly recover power supply of users in the non-fault area, meanwhile, a current power failure fault point checking plan is accurately given, the maintenance personnel are guided to timely process in place according to equipment positioning information, the power failure rush repair efficiency is improved, the power failure event response time is shortened, and the power supply service quality is improved.