The invention relates to the field of building construction, and provides a construction method of a reinforced concrete wall aiming at the problem that existing concrete is difficult to meet the strength requirement of a reinforced concrete wall body. The method comprises the following step of S1, measurement and line laying; S2, building a pouring formwork; S3, pre-embedding reinforcing steel bars; S4, preparing concrete; S5, pouring concrete; and S6, disassembling the pouring formwork. The concrete comprises the following components in parts by mass of 20-25 parts of Portland cement, 10-12parts of water, 75-80 parts of sand, 10-15 parts of fly ash, 5-7 parts of mineral powder, 0.5-1 part of a silane coupling agent, 1-3 parts of fatty alcohol polyoxyethylene ether, 0.5-1 part of O-nitrododecane ether and 0.01-0.02 part of 6-phenyl-3-pyridazinone. Through mutual cooperation of fatty alcohol polyoxyethylene ether, O-nitrododecane ether and 6-phenyl-3-pyridazinone, the compressive strength and the anti-cracking strength of the reinforced concrete are improved, the reinforced concrete wall is less prone to cracking when subjected to load, and the concrete is easier to meet the strength requirement of the wall body.