In order to clarify the effects of acid soil amendments combined with intercropping on soil physical and chemical properties and nutrient content in young citrus orchards，quicklime and quicklime + fire soil ash were selected as acid soil amendments，mung bean and sweet potato were used as intercropping crops，and soil clean tillage was used as control. The effects of different acid soil amendments and intercropping crop combinations on soil physical and chemical properties，total and available nutrient contents and active aluminum content were systematically studied. The results showed that compared with the soil clean tillage treatment，the application of soil amendments combined with intercropping significantly reduced soil bulk density，increased soil porosity，soil saturated water holding capacity and field water holding capacity，significantly increased soil pH value and organic matter content and reduced active aluminum content(P<0.05)，and increased soil total and available nutrients to varying degrees. Compared with the application of quicklime，the cumulative effect of long-term application of quicklime + fire soil ash was obvious，which was better in improving soil physical properties，increasing soil pH and organic matter content，reducing active aluminum content，and increasing soil total potassium，available potassium and available phosphorus content. There was no significant difference in most soil physical and chemical properties between intercropping mung bean and intercropping sweet potato，but intercropping sweet potato had better effect on improving soil field capacity and organic matter content，while intercropping mung bean was more conducive to improving soil total nitrogen，total phosphorus and alkali-hydrolyzable nitrogen content. In general，the application of quicklime + fire soil ash combined with interplanting sweet potato / mung bean could effectively improve the physical and chemical properties of citrus orchard soil.