Method and device for measuring optical fiber asymmetry time delay

Disclosed are a method and apparatus for measuring optical fiber asymmetry time delay. The method comprises: an RTU configuring working states of a Master and a Slave at two ends of an optical fiber line; the RTU delivering an instruction to measure a first optical fiber, and a Master side PPU sending a message, recording a sending time stamp t1 and transmitting the sending time stamp t1 to the Slave; a Slave side PPU receiving the message, recording an arrival time stamp t2, and storing the arrival time stamp t2 corresponding to t1; the RTU displaying that measurement for the first optical fiber is completed, preparing to measure a second optical fiber, and swapping the two optical fibers; the RTU delivering an instruction to measure the second optical fiber, and the Master side PPU sending a message, recording a sending time stamp t'1 and transmitting the sending time stamp t'1 to the Slave; the Slave side PPU receiving the message, recording an arrival time stamp t'2, and storing the arrival time stamp t'2 corresponding to t'1; and an ACU calculating an asymmetry time delay compensation value and sending the asymmetry time delay compensation value to the RTU. The present invention is not limited by sites, saves cost and labor, is simple and fast, and has short stabilization time as well as high testing efficiency and precision.