The invention discloses a protection method for avoiding line break disorder actions of a power transmission line. The method comprises the following steps of S1, if the same phase at two ends of a certain line has no current or has a capacitive current, judging that a line break fault occurs in a power grid near to the line; S2, judging a line break fault occurrence area, wherein the method for judging the line break fault occurrence area comprises the step that if the line break fault occurs in the power grid near to the line and zero sequence power directions at two ends of the line are forward directions, the line break fault occurs in the line; and S3, accelerating zero sequence last segment protection actions through protection of the power transmission line in which the line break fault occurs and removing the line break fault of the power transmission line. According to the method, the line break fault can be effectively removed and the secure and stable operation of a power system can be ensured.