Effects of silicon-calcium-potassium magnesium fertilizer combined with fulvic acid potassium on soil chemical properties，leaf function，fruit yield and quality in Yanfu 3 apple orchard with acidified soils were studied in Yantai area.The results showed that soil pH value，the contents of alkali-hydrolyzale nitrogen，available potassium，exchangeable calcium and magnesium，and cation exchange capacity were increased by silicon-calcium-potassium-magnesium fertilizer，compared with control.The contents of soil organic matter，available potassium，exchangeable calcium and cation exchange capacity were significantly increased by 11.6%，24.8%，24.7% and 1.55 cmol/kg，respectively，by applying silicon-calcium-potassium-magnesium fertilizer combined with fulvic acid potassium.Leaf SPAD value and leaf area increased significantly by 11.9% and 16.1% compared with control by applying silicon-calcium-potassium-magnesium fertilizer combined with fulvic acid potassium，while increased by 6.05% and 8.39% when applying silicon-calcium-potassium-magnesium fertilizer alone.Applying silicon-calcium-potassium-magnesium fertilizer combined with fulvic acid potassium significantly increased fruit weight and yield by 9.4%～11.8% and 11.4%～14.8%，respectively.Fruit soluble solid，solid acid ratio，Vc content and fruit firmness increased significantly by 8.6%～10.2%，14.1%～16.8%，10.1%～12.3% and 3.2%～3.8%，respectively.Comprehensive evaluation showed that silicon-calcium-potassium-magnesium fertilizer could effectively improve soil chemical properties，function of apple leaves，and yield and quality of fruit.Effects of silicon-calcium-potassium-magnesium fertilizer combined with fulvic acid potassium was more significant than silicon-calcium-potassium-magnesium fertilizer alone in apple orchard with acidified soils.