The invention discloses a detector for an optical fiber breakpoint, which comprises an EPON (Ethernet Passive Optical Network) analyzer, a tee optical splitter and an optical fiber jumper, wherein the EPON analyzer comprises an EPON OLT (Optical Line Terminal) optical module and an EPON ONU (Optical Network Unit) optical module; the EPON OLT optical module is connected to a first end of the tee optical splitter through an optical fiber, the EPON ONU optical module is connected to a second end of the tee optical splitter, one end of the optical fiber jumper is connected to a third end of the tee optical splitter, and the other end of the optical fiber jumper is connected to the tail end of a detected optical fiber; and the tee optical splitter is used for splitting optical signals reflected from a breakpoint of the detected optical fiber into two beams, one beam is spread towards the direction of the EPON OLT optical module, and the other beam is spread towards the direction of the EPON ONU optical module. The invention further discloses a corresponding test method. According to the invention, improvement is carried out on an existing EPON instrument, the structure is simple, the cost is low, operation is carried out easily, and a technical blank of short-distance optical fiber breakpoint testing is made up.