The invention discloses sugar-juice syrup floating clarification process used in carbonation method. The sugar-juice syrup floating clarification process comprises two processes, namely, a preparation process of crude syrup and a preparation process of white granulated sugar, wherein the preparation process of crude syrup comprises ten steps, namely, primary heating, first carbonation, secondary heating, filtering and the like and the preparation process of white granulated sugar comprises five steps, namely, secondary sulfitation, sugar boiling, crystallizing, crystallization promoting and honey separation. Since the syrup floating impurity removal process added in the traditional sugar production process by virtue of the carbonation method, high-quality materials are provided for material boiling in each section of the subsequent sugar boiling so that the product quality is improved, brown granulated sugar remelt syrup can be treated at a certain ratio, the colloid and impurities in the remelt syrup can be effectively removed, the honey production factors are decreased and thus the viscosity of the material is reduced and the boiling of various sugar pastes and sugar recovery are facilitated.