The utility model relates to a junction box technical field, especially a novel fiber distribution box, comprises a box bod, one side of box body is provided with main wiring end, and the opposite side is provided with a plurality of distribution terminals, the box body internal fixation has the controller, be provided with light signal detecting element between main wiring end and the distribution terminal, light signal detecting element is connected with the controller input end, the output of controller is connected with the LED pilot lamp. After the structure of the oil adding device is adopted, the utility model discloses a whether the fiber communication that optical tester and optical time domain reflectometer detected in the junction box is normal, if which communication is abnormal, the LED pilot lamp which is then controlled is bright, in addition, can be with the long -range mobile terminal who sends for maintainer of signal intelligence.