The invention discloses a wave-recording synchronization method for a fault indicator of a transient wave-recording type, and the method is used for solving the problems of the 100-micron synchronouswave-recording requirement and low power consumption requirement of the fault indicator of the transient wave-recording type. A gathering unit sends a time checking instruction to a collecting unit, and realizes the time checking of a communication time sequence and the data sampling. The collecting unit records the position of a first sampling point after the moment of the time checking, and thedifference between the positions of the two time-checking points. When a fault occurs, other collecting units determine a waveform data extraction area and an extraction mode by performing simple logical judgment of the received sampling point position and difference information of a fault phase to realize the wave-recording synchronization. The method avoids the sending and receiving of a wake-upframe in the communication, simplifies a time checking response mechanism, saves a complicated crystal vibration compensation algorithm and a method of increasing the time-scale attribute of the sampling points, improves the execution efficiency of a CPU, ensures the wave recording synchronization, and meets the low power consumption requirements of the collecting unit.