The invention relates to a broadband carrier-based courts identification method, which is mainly applied to a centralized meter reading scheme in a broadband power line carrier communication environment. The invention provides the broadband carrier-based courts identification method, comprising the following steps: S1, clock synchronization is carried out on concentrators and electric meters belonging to the same transformer and positioned in the same network; S2, the concentrators issue courts dividing commands; S3, the electric meters monitor id of more than two concentrators, and S4 is carried out if the courts dividing commands are issued by one concentrator with weak signals, otherwise, courts dividing tasks are given up; and S4, the electric meters judge whether the deviation betweenthe zero-crossing time of the concentrator that has the weak signals and issues the courts dividing commands and the zero-crossing time of the electric meters is abnormal. According to the method, ahigh-precision courts division function can be achieved without adding of any auxiliary equipment on a centralized meter reading scene.