A field trial was conducted to investigate the effects of intercropping three leguminous green fertilizer varieties (i.e., Chamaecrista rotundifolia (Pers.) Greene, Vigna sesquipedalis and Indigofera hendecaphylla Jacq.) in olive orchards on the fruit apparent traits, nutritional quality, soil erosion in the topsoil layer, and basic fertility. The results showed that intercropping three green fertilizer varieties in olive orchards, compared to the control treatment, the vertical diameter of olive fruit increased by 3.23%-13.55%, the horizontal diameter increased by 20.00%-29.33%, the single fruit weight increased by 13.57%-26.55%, and the yield increased by 11.36%-28.41%; The water-soluble total sugar content of fruits increased by 8.58%-31.09%, the dripable acid content of olives reduced by 5.56%-3.70%, and nitrate content decreased by 3.35%-13.42%; The loss thickness of surface soil in orchards reduced by 15.2%-36.4%;The soil total nitrogen, total phosphorus, alkali hydrolyzed nitrogen and available phosphorus increased by 11.4%-49.4%, 20.0%-212.0%, 18.5%-40.7% and 351.6%-3016.1%, respectively.