The invention discloses a constructional column joint bar and tie bar joint bar positioning and installing method. The method comprises the steps that constructional column joint bars and tie bar joint bars are machined with a steel bar machining machine according to the designed and specified lengths, cross central lines are positioned and flexibly arranged on a shear wall, a frame column side formwork and a beam and slab bottom formwork according to the design and construction scheme positions of the constructional column joint bars and the tie bar joint bars, drill holes are formed, and the shear wall, the frame column side formwork and the beam and slab bottom formwork are conveyed to all floors to be installed in sequence; when the shear wall, the frame column side formwork and the beam and slab bottom formwork are installed, and the cross central lines on the shear wall, the frame column side formwork and the beam and slab bottom formwork are corrected and adjusted through infrared laser measurement to precisely position preformed holes, for the constructional column joint bars and the tie bar joint bars, in the shear wall, the frame column side formwork and the beam and slab bottom formwork. By means of the installation method, use is safe and reliable; when the constructional column joint bars and the tie bar joint bars are precisely positioned and installed, the quality and labor efficiency are effectively improved, the construction speed is increased, field raised dust control is guaranteed, and the construction period is ensured.