Acidic soils are widespread in main citrus producing areas of China. Acidification，together with other soil obstacles such as poor soil structure，low soil fertility，is increasingly becoming an important limiting factor to reduce fertilizer input，increase citrus yield and quality，and to realize green development in main citrus producing areas in China. Compared with traditional soil conditioners，organic-derived soil conditioners are expected to reduce soil acidity，enhance soil fertility，promote nutrient uptake by trees，increase citrus yield and improve fruit quality，simultaneously. However，the effectiveness of different organic soil conditioners (OSC) may be varied. Therefore，two-year field experiment was conducted to evaluate the effects of organic fertilizer (T1)，biochar (T2)，shell powder (T3) and compound conditioner (organic fertilizer + biochar + shell powder，T4) on soil physicochemical properties，leaf nutrient content of non-fruit spring flush，fruit yield and quality in acidified citrus orchard. The results showed that compared with the treatment without OSC (CK)，soil pH was increased by an average of 0.44，and the soil acidity was significantly decreased in treatments with OSC (T1-T4) after two-year application. At the same time，the contents of soil alkaline nitrogen，available phosphorus，available potassium，exchangeable calcium and exchangeable magnesium were also significantly increased，while soil compactness was significantly decreased in T1-T4 treatment. The SPAD value and nitrogen，phosphorus and potassium content in leaves were increased by OSC application，with the best performance by compound conditioner treatment (T4). Compared with the control，the citrus yield was increased by 8.8%-16.7% with OSC treatments (T1-T4)，and the economic benefit of the compound conditioner treatment (T4) was the highest. Compared with CK，soil conditioners treatments (T1-T4) significantly increased fruit total soluble solids 0.85-2.45，single fruit weight，ratio of total soluble solids/titratable acid，ratio of total soluble sugars/titratable acid，and thus improved the comprehensive fruit quality. Over all，the compound conditioner treatment resulted in the best performances in improvement of soil acidification and soil fertility，nutrient uptake，fruit yield and quality，and nutrient use efficiency，which could provide technical support to improve citrus orchards with acidified soils in China.