Building construction steel bar positioning and mounting method

The invention relates to the technical field of building construction, and discloses a building construction reinforcing steel bar positioning and mounting method which comprises the following steps: S1, wall surface reserved joint bars are trimmed, specifically, the reserved reinforcing steel bars are adjusted to be straight, and the surfaces of the reinforcing steel bars are cleaned; s2, ladder bars are erected, specifically, the distance between horizontal steel bars of the wall is controlled, the ladder bars are arranged about 50 mm away from the wall edge, the arrangement distance is not larger than 2 m, at least two ladder bars are arranged on each wall, two horizontal steel bars are bound to the positions, 0.75 m away from the lower portions of the ladder bars, of the lower portions of the ladder bars, and vertical steel bar division lines are drawn on the horizontal steel bars; s3, reinforcing steel bar binding; s4, protection layer cushion blocks or plastic clamping rings are installed, the distance