The utility model discloses a branch tower with a corner cross arm, wherein at least two cross arms are fixed on a tower-body of the branch tower, an included angle is between the two cross arms to cause transmission wires on the two cross arms with different trends. The branch tower with the corner cross arm of the utility model causes the lower layer of wires to be arranged according to the corner and the upper layer of wires to be suspended in a straight line through the arrangement of the cross arms at an upper and lower layer of loop wires. After adopting the utility model, the arrangement of the iron tower is more convenient and jumper connection mode is simpler. Particularly, since the wires with larger load generally adopt linear arrangement, and the wires with smaller load adopt corner arrangement, the utility model markedly reduces self-weight of the tower-body, reduces cost of manufacture and construction.