The invention discloses a ceramic cutting tool cutting parameter optimization method on interrupted cutting conditions. The method comprises the steps that parameters of a ceramic cutting tool are determined; the initial state value and the critical state value of microscopic damage to the ceramic cutting tool are determined; parameters of workpiece materials are determined; geometrical shapes of the cutting tool and workpieces are set in finite element simulation software, and all the relevant parameters of cutting tool materials and the workpiece materials are imported; cutting parameter combinations adopted in the finite element simulation process are determined through an orthogonal experimental design method; the maximum damage equivalent stress value is calculated; the cutting parameter combination with the minimum value is selected. According to the ceramic cutting tool cutting parameter optimization method, the influences of the cutting tool microscopic damage state and external loads on invalidation of the cutting tool are considered, and meanwhile the orthogonal experimental design method is adopted, so that the optimization precision of the cutting parameter combinations is higher; the cutting parameter combinations are optimized, and the cutting parameter optimization cost is greatly reduced; the ceramic cutting tool cutting parameter optimization method can be widely applied to optimization of the cutting parameter combinations on the various interrupted cutting conditions, and the purpose of prolonging the service life of the cutting tool is achieved finally.