[Objectives] The study aims to verify the application effect of silicon-containing water-soluble fertilizer on fast vegetables[Methods] Two vegetable crops, rape and lettuce, were studied, and three treatments were set up, including treatment 1 (conventional fertilization + foliar spraying of silicon-containing water-soluble fertilizer, treatment 2 (conventional fertilization + foliar spraying of the same amount of clear water), and treatment 3 (conventional fertilization). [Results] The yield of lettuce and rape in treatment 1 increased by 15.1% and 8.6%, respectively; compared with treatment 3, the yield of lettuce and rape rose by 18.6% and 10.9%, respectively. Variance analysis shows that the F values of lettuce and rape were 20.938 and 35.372, respectively, and the differences among various treatments were extremely significant. [Conclusions] The application of silicon-containing water-soluble fertilizer on lettuce and rape significantly increased their yield.