Abstract: Agricultural non-point source pollution evaluation is a key for the harmonious development between agricultural production and environmental protection. However, different pollution factors have distinctive environmental impact processes, leading to varied outcomes. As a result, building a scientifically sound model for evaluation of agricultural non-point pollution index is crucial to improve rural living conditions. This research developed a quantitative evaluation model based on agricultural non-point source pollution indicators. With the model, the weights of the indicators were calculated using Analytic Hierarchy Process (AHP), the original values of the indicators were standardized, and the comprehensive evaluation values of the agricultural non-point source ecological environment were calculated. Finally, agricultural non-point source environmental grades were established, enabling the quantitative assessment of the agricultural non-point source environment. The application process was illustrated as an example of Xinfeng River Rainwater Gathering Area in a county of Heyuan City, Guangdong Province. The comprehensive evaluation results indicate that the agricultural non-point source ecological environment quality evaluation value of the county is 0.334, reflecting a relatively good agricultural non-point source environment. The pollution levels and types vary across different towns. Among them, the evaluation values of DH, XD and SJ towns ranged from 0.7 to 0.9, requiring special attention. SP and BT towns scored higher in crop farming pollution index, while DH, SJ and XD towns scored higher in livestock pollution index. GG, DH, SJ and XD towns scored higher in rural domestic pollution index. Based on different pollution source types, this study proposes corresponding treatment measures, including source prevention, process control, and end treatment to reduce non-point source pollution of crop farming. It advocates the active implementation of an integrated crop-livestock system, improvement of the treatment and utilization of livestock manure, selection of treatment models suited to the specific conditions of rural areas, and active promotion of the construction of rural domestic sewage treatment projects. The model is characterized by its suitability to the characteristics of agricultural non-point source pollution, as well as its standardization and quantification. It can be widely applied to the evaluation of agricultural non-point source pollution in similar areas.