The utility model relates to conductor sag distance measuring equipment for a high-voltage transmission line. The equipment comprises multiple sag range finders, a second single-chip microcomputer and a computer, wherein each sag range includes a laser range-finding sensor and a first single-chip microcomputer connected with the laser range-finding sensor; the second single-chip microcomputer is connected with the first single-chip microcomputers via a data bus; and the computer is connected with the second single-chip microcomputer via a wireless channel. According to the utility model, the multiple sag range finders, a meteorology detector and a high-voltage line parameter detector are respectively used to monitor sag data, meteorology data and high-voltage line parameter data, the monitored data is then transmitted to the second single-chip microcomputer, and the second single-chip microcomputer transmits the data to the computer via wireless signals for data processing, thereby obtaining the conductor sag of the high-voltage transmission line.