The utility model discloses a variable cross section assistance -localization real -time angle steel for the construction of transmission line iron tower, including set up the support angle of lower part steel, with leading role's steel of support angle steel upper portion fixed connection's angle cleat, lower part and angle cleat fixed connection, the inboard angle steel back of the body with support angle steel upper portion in the lower part of angle cleat is connected, the angle steel on angle cleat upper portion is carried on the back and the inboard of leading role's steel lower part being connected, set up a plurality of through -holes on leading role's steel, support angle steel lower part sets up the locating plate. The utility model discloses a variable cross section assistance -localization real -time angle steel makes things convenient for position control, practices thrift construction material.