The invention discloses a method and a device for detecting an optical fiber fault point. The method comprises the following steps: finding a corresponding relationship to be processed including offline user side equipment from a database in which the corresponding relationship to be processed is saved specific to each of the acquired offline user side equipment when an OTDR (Optical Time Domain Reflectometry) detects one or more branch fault points; and deleting the branch fault points and the offline user side equipment in the found corresponding relationship to be processed from the detected branch fault points and the acquired offline user side equipment. Through the technical scheme provided by the invention, under the condition of not adding auxiliary test equipment, the selection range of the corresponding relationship to be processed is narrowed well, and the maintenance workload is lowered, so that the network maintenance complexity is lowered.