The invention discloses a distributed-type fault-locating system, comprising a power transmission line and characterized by comprising a spherical unit and a monitoring host. The spherical unit is mounted on the power transmission line. According to the invention, it is possible to precisely locate multi-branch power line fault. All that needs to do is detect the initial wave head of a fault that can be easily performed. Then, the fault locating can be completed. This overcomes the problems in the prior art for fault locating that the reflection and deflection of waves are hard to detect.