The invention belongs to the field of architectural engineering, and provides a planting bar connection structure of a load-bearing bar in a concrete beam. According to the technical scheme, an overlapping steel plate is welded to a vertical load-bearing longitudinal bar of a vertical component in an equal pressure mode, wherein the overlapping steel plate is made of the same material as the vertical load-bearing longitudinal bar, the other end of the overlapping steel plate is welded to a beam-internal load-bearing longitudinal bar in the concrete beam, or a rebar adapter welded to the otherend of the overlapping steel plate is connected with the beam-internal load-bearing longitudinal bar in the concrete beam. By adopting the connection method, it can be ensured that the connected longitudinal load-bearing bars in the concrete beam can be conveyed into the vertical component directly through the overlapping steel plate, and thus the damage to concrete by adopting a chemical bar planting method in the concrete is reduced or avoided.