The invention discloses a coordinate calibration method for power transmission line towers. The method includes that firstly, relative parameters of a power transmission line tower are obtained, then measuring span is calculated according to a tower measuring coordinate, and comparison is performed at operating span. When an error exceeds a permissible error, a coordinate of a base tower is in error probably. Coordinate calibration is performed on towers required to be calibrated by judging whether incorrect towers are one singe base tower, two adjacent base towers or continuous towers, combining size and signs of the errors to determine the towers which need to be calibrated, finally combining corner conditions of the towers and the operating span, and using a measuring tool in geographic information software. The method can find the towers with large errors in a power transmission line measuring coordinate conveniently, reduces workload that people go to a field to measure a tower coordinate again, and effectively improves positioning accuracy of a lightning positioning system and authenticity of line lightning parameters.