The invention relates to a preparation process of waterborne coating. The preparation process comprises the following specific steps of base material selection, first-time stirring, grinding treatment, auxiliary material selection, second-time stirring, filtration and screening, detecting, packaging and other procedures. According to the preparation process, the problems that in the production andmanufacturing process of existing waterborne coating, raw materials for manufacturing the waterborne coating need to be filtered and screened manually, smell emitted in the waterborne coating causeshuman body discomfort, the raw materials are filtered through manual control, consequently substandard raw material particles are prone to being mixed, the using effect of the waterborne coating is affected, the size of the raw material particles has the precise requirements, when the raw materials are filtered manually through filtering tools, sieving holes of the filtering tools are prone to being blocked by the large particles, the raw material filtering efficiency is affected, the waterborne coating manufacturing time is affected, when the filtering tools are controlled manually for sieving and filtering the raw materials, the raw materials are prone to being spilled in the jolting process, the closed filtering tools are selected, and consequently, clearing is troublesome after work can be solved.