[Objective] The sources, migration characteristics, and influencing factors of non-point source pollution in orchards were analysed in order to provide theoretical support for scientifically aid in preventing and controlling non-point source pollution from orchards and improving the quality of soil and water environments. [Methods] Based on the latest research results (both domestically and abroad), the source, migration characteristics, and influencing factors of pollution by nitrogen, phosphorus, heavy metals, and pesticides in orchards were analysed. Existing research deficiencies were analysed and future research directions were proposed. [Results] ① The application intensities of nitrogen fertiliser in orchards 〔565—1 071.2 kg/(hm²·a)〕 and loss coefficients of nitrogen and phosphorus were generally higher than those in farmland. Nitrogen and phosphorus accumulated easily at the bottom of the orchard slope, and their spatial variabilities in soil were higher than those in the farmland and tea gardens. ② When the orchards were not irrigated by sewage and industrial activities were absent, fertilisers, pesticides, and traffic activities were the main sources of heavy metals in the orchard soil, and the migration ranges of heavy metals in the soil profile were approximately 0.005—0.8 m. ③ The dosages of benzimidazole and pyrethroid pesticides in orchards were approximately 40—4 050 and 60—150 g/hm², respectively. After application, weakly adsorbed pesticides were significantly affected by short-term rainfall, whereas moderately adsorbed pesticides were affected by rainfall and evaporation. The pesticide content in the river showed a seasonal correlation with rainfall. ④ To control non-point source pollution in orchards, the treatment of initial runoff must be prioritised to effectively intercept the sediment. Planting grasses under fruit trees can reduce runoff by 7.1%—98.7%, control sediments by 15.7%—99.8%, intercept nitrogen and phosphorus by 4.6%—98.5 and 15.3%—96.6%, respectively, and reduce heavy metals by 18.8%—90.1%. ⑤ The migration characteristics of non-point source pollution from orchards were consistent with the temporal and spatial distributions of rainfall. In particular, 20% of the surface runoff produced more than 50% of the pollution load. Under extreme rainfall, the runoff coefficients and loss loads of nitrogen and phosphorus in orchards were 2.6 and 11.5 fold higher than those under normal rainfall. Rainfall volume and intensity were the main factors affecting the migration of heavy metals and pesticides. Under rainfall with long duration and moderate intensity, heavy metals and pesticides were more likely to infiltrate and migrate downstream. [Conclusion] The management of orchards in China is still in its infancy. In the future, the migration laws of non-point source pollution, such as nitrogen, phosphorus, heavy metals and pesticides, under the influence of complex factors must be explored, the spatiotemporal scope and degree of non-point source pollution should be accurately identified, and the loss of non-point source pollution should be effectively reduced to ensure the quality of fruits, improve the ecological benefits of orchards, and reduce environmental risks.