Abstract: 【Objective】The study was to develop a slow-release fertilizer that is simple and effective, and contains multiple nutrients.【Method】On the basis of PSRF, a biodegradable polymer slow-release fertilizer containing nitrogen, phosphorus and potassium elements developed earlier, a polymer slow-release silicon fertilizer（Si-PSRF）containing nitrogen, phosphorus, potassium and silicon elements was prepared by introducing sodium silicate. Through FTIR, XRD, TG and other characterization methods combined with tomato pot experiments, effects of the introduced sodium silicate on composition and structure of Si-PSRF, slow-release performance of elements and tomato yield were studied.【Result】 Structural characterization showed that the silicic acid gel and more short-chain PSRF contained in Si-PSRF affected the nutrient release characteristics of fertilizers. Tomato pot experiment showed that, the nitrogen and phosphorus utilization efficiency and tomato yield under Si-PSRF treatment increased by 185.65%, 128.57% and 24.01% respectively compared with those under PSRF treatment.【Conclusion】The introduction of sodium silicate into PSRF can promote the absorption and utilization rate of nutrient elements in tomato plants and increase the tomato yields, which is suitable to be used as fertilizer in practical agricultural activities.