The invention relates to a construction method of a wiener plate light composite grouting wall system. The method comprises the following steps of material selection and thickness determination, non-bearing partition wall steel keel manufacturing and installation, wiener plate installation, pipeline manufacturing and laying, light composite grouting filler filling and light composite grouting material wall joint treatment. A grouting wall constructed by the construction method can achieve the performances of light weight, high strength, water resistance, fire resistance, heat insulation, goodsound insulation performance, environmental protection and the like. A face plate and a keel can be directly installed and grouted after being machined in a factory and reaching the site, complex construction procedures such as ring beams, structural columns, steel bars and the like existing in a traditional wall body are avoided, the construction speed is high, no pollution such as waste materials, dust and noise is caused, the construction quality and the construction safety of the wall body can be better guaranteed, the site civilized construction is facilitated, and the construction methodhas the obvious characteristics of reliable, safe and efficient construction and advanced technology.