The effects of potassium sulfate combined with polyhalite on apple growth and soil quality were investigated in a field experiment conducted in Jimo, Shandong Province for two consecutive years under the control of equal amounts of nitrogen, phosphorus and potassium. The results showed that compared with potassium sulfatealone (S), polyhalite combined with potassium sulfate significantly promoted apple growth and soil quality. Among them, 16% polyhalite +84% potassium sulfate combinedtreatment at the basic fertilization stage (SP) had the highest yield, which was significantly higher than that of S treatment (P<0.05), with an average increase of 24.00% in two years. Compared with S treatment, the contents of VC, soluble solid, anthocyanin, soluble sugar and other quality indexes were increased to a certain extent in polyhalite combined with potassium sulfate treatment, but most of the differences among treatments were not significant (P>0.05). Compared with S treatment, polyhalite combined with potassium sulfate treatment effectively alleviated soil acidification and enhanced soil nutrient supply capacity. Among them, SP and SP1 treatments (16% polyhalite +84% potassium sulfate combined application in basic fertilization stage and 8% polyhalite +92% potassium sulfate combined application in fruit setting stage) increased soil pH by 0.32 and 0.45 units on average, respectively. SP1 treatment significantly increased the contents of exchangeable Ca and Mg in soil (P<0.05), with an average increase of 34.97% and 32.10%, respectively. Compared with S treatment, SP treatment increased soil microbial richness and changed community structure in root zone. Among them, the Chao1 index and Shannon index increased by 12.15% and 4.04% respectively. The relative abundance of Acidobacteria increased by 7.53%, and that of Proteobacteria decreased by 5.72%. In conclusion, compared with the single application of potassium sulfate, the partial replacement of potassium sulfate with polyhalite has positive significance for fruit yield, quality and soil environment improvement in Jiaodong apple producing area, and the application of 16% polyhalite instead of potassium sulfate is better in the basic fertilization stage.