Using Taoyouxiangzhan and Yuzhenxiang of high-quality late rice as experimental materials, field tests were conducted to investigate silicon fertilization on its lodging resistance and yield. Four silicon application treatments were set up: CK, T1, T2 and T3, corresponding to silicon application amounts of 0, 75, 150 and 225 kg/hm2. The results showed that the basal internode breaking moment of stems increased significantly under T2 and T3 treatment compared with no silicon application, and the percentage of Taoyouxiangzhan increased by 8.96% to 11.11%, and that of Yuzhenxiang increased by 13.02% to 16.29%. The internode lodging index of late rice was significantly lower than that of no silicon treatment, and the decrease of Taoyouxiangzhan was 12.02% to 19.51%, and that of Yuzhenxiang was 12.68% to 22.31%. The application of silicon fertilizer could improve the morphology of the upper three leaves and increase the silicon content in stems with the percentage of Taoyouxiangzhan increased by 2.01% to 23.27% and the percentage of Yuzhenxiang increased by 1.19% to 11.33%. In addition, silicon application could increase the yield with T1 application showing the best yield increase effect. The actual yields of T1 of Taoyouxiangzhan and Yuzhenxiang increased by 6.81% and 11.95% respectively compared to the CK. Considering that there was no substantial lodging in the current season during this experiment, combined with the yield and cost-effectiveness, the recommended silicon application amounts for the test varieties Taoyouxiangzhan and Yuzhenxiang were 75 kg/hm2.