The invention provides a construction method for a wall-body constructional column joint bar. The construction method is used in the engineering construction process of a major structure of wall-body construction of constructional engineering, a positioning steel plate serves as a concrete pouring bottom mould, and pre-buried constructional column joint bar holes are evenly formed in the four directions of the positioning steel plate; and pre-buried constructional column joint bars penetrate through the holes, lower stirrups and upper stirrups are arranged at the bottoms and on the upper portions of the pre-buried constructional column joint bars correspondingly to conduct limiting and fixing, constructional column joint bar limiting block ribs are pre-buried on the positions of the holes to ensure the integral structure to be stable, and the positioning steel plate serves as the concrete pouring bottom mould, and concrete pouring is conducted from the upper stirrups down. By adopting the construction method, rear planted steel bars are avoided, the construction cost of steel bar planting is saved, the construction quality can be more ensured, and green construction is achieved.