The invention relates to a distance protection method for a wind power generation transmission line. According to the method, firstly, whether a fault happens is judged; when the fault occurs, fault phase selection is carried out; according to the result of fault phase selection, a fault direction and a fault distance are measured; according to a fault distance calculation result and a fault direction judgment result, distance protection logic judgment is carried out in 20 ms after the fault occurs, and accordingly whether protection actions are carried out is judged. The distance protection method can solve the problem of frequency deviation when a wind power system breaks down and can control influences of system actions on transmission line distance protection.