Continuous fiber detecting method and device

The invention discloses a continuous fiber detecting method, and belongs to the field of the optical communication technology. The method is applied to one site; at least a fiber is connected between an outbound port and an inbound port; and the side includes at least one light emitting element. The method includes the following method that: a path which at least includes a sending terminal single board and a receiving terminal single board; according to a continuous fiber relationship, a cross is created and attenuation regulation is carried out to make light pass through the path; attenuation on the path is adjusted, and whether the light passes through an entrance of the receiving terminal single boar is judged; if no light passes through the entrance, the wrong continuous fiber in the path is determined; and if the light passes through the entrance, a theoretical light energy change value and an actual light energy change value of the path are calculated, and according to a difference therebetween, a quality of the continuous fiber in the path is determined. In the invention, the continuous fiber quality detection and the single site continuous fiber detection are realized.