The invention relates to a transmission line pay-off construction guide rope distributing process specifically comprising the following steps: towers are arranged according to a line branching construction process; (2) a pay-off block descends, and the original vertical hoisting position of a traction walking board gradually inclines; (3) the pay-off block moves forward under traction, a hook at the lower end of the pay-off block is opened, the pay-off block is separated from the traction walking board, and traction equipment is started to enable traction ropes to pull the traction walking board to move transversely; and (4) the steps (1)-(3) are repeated until the traction walking board arrives at the position of next tower, construction is carried out on the towers step by step, and the guide ropes are automatically distributed and placed in corresponding cable installation positions. According to the transmission line pay-off construction guide rope distributing process of the invention, the traditional pay-off process is changed, original traction ropes are changed into light and heat-resistant insulating ropes in distribution, and the light and heat-resistant insulating ropes respectively replace the traction ropes in wire traction. Construction is reduced, the number of used equipment including a tension pay-off machine and winching equipment is reduced, the construction procedure is simplified, the construction cost is lowered, and the construction efficiency is improved.