The main safety problems and reinforcement design schemes of the substandard dike of a dike project, focuses on the comparative analysis of grouting seepage prevention schemes of the dike, and designs the optimized cone probe grouting in detail. On this basis, the saturated-unsaturated, stable-unstable seepage finite element calculation theory is adopted to calculate the stable seepage field and the unstable seepage field under the condition of sudden drop of water level of the dike before and after seepage control and reinforcement by cone probe grouting, and the seepage behavior such as the variation law of pore water pressure of the dike body is studied, and the corresponding stability calculation of the dike slope is carried out. The results show that, after the reinforcement by cone probe grouting, the seepage flow and escape slope of the embankment are obviously reduced, the infiltration line is lowered, and the anti-seepage effect is remarkable, and the safety factor of anti-sliding stability of the embankment slope is obviously improved under various working conditions.