The invention discloses a method for recovering high-purity products from an acid washing waste liquid step by step. The method comprises the following steps: 1, recovering fluosilicate, wherein silicon or silicon dioxide is added into an acid washing waste liquid to convert the HF in the waste liquid into H2SiF6, a first precipitant is added into the converted H2SiF6, a neutralization salifying reaction is performed to generate fluosilicate precipitate and generate a first mother liquor, and the obtained fluosilicate precipitate is cleaned, dried and powdered to obtain a first target productfluosilicate; 2, adding a second precipitant into the first mother liquor, carrying out a replacement reaction to generate sulfate precipitate and a second mother liquor, cleaning the obtained sulfateprecipitate, drying, and powdering to obtain second target sulfate; and 3, evaporating and concentrating the second mother liquor, carrying out cooling crystallizing to generate crystallized nitrate,drying, and powdering to obtain a third target product nitrate, wherein a third mother liquor is generated, 80% of the third mother liquor is refluxed and reused to be mixed with the second mother liquid, and 20% of the third mother liquor is treated according to dangerous solid waste. According to the method, high-purity fluosilicate and nitrate are sequentially recovered step by step, the recovered products can reach related standards such as GB/T36936-2018, GB/T4553-2016 and the like, the cost is low, the recovery effect of the acid washing waste liquid is good, and environmental pollutionis small.