In order to study the improvement effects of soil conditioner on soil physicochemical properties, apple yield and quality of acidified orchard soil, four treatments were designed which included common soil conditioner + conventional fertilization, humic acid soil conditioner + conventional fertilization, humic acid soil conditioner 85% application + conventional fertilization, and equal nutrient fertilizer + conventional fertilization. The results showed that the humic acid soil conditioners improved the physicochemical properties of acidified soil and increased apple yield and quality in acidified orchard. Compared with common soil conditioner, humic acid soil conditioner reduced soil bulk density by 2.72%-4.76%, and increased silt content, porosity, rapid potassium and pH by 3.12%-5.28%, 1.74%-3.54%, 3.74%-10.57% and 0.07-0.45 units, respectively. Meanwhile, humic acid soil conditioner increased apple yield by 4.84%, even 85% of humic acid soil conditioner application still increased apple yield by 2.87%. In addition, humic acid soil conditioner increased total sugar content by 9.35%-15.46% and reduced sugar acid by 21.84%-46.58%. In conclusion, humic acid soil conditioner of 1 275 kg/hm2 under conventional fertilization is regarded as the effective way in improving soil quality and apple yield and quality in short term for acidified orchard in Jiaodong area (pH<4.5).