Agricultural irrigation is the main way of water consumption in arid and semi-arid areas of north China. The level of agricultural water-saving directly determines the amount of regional available water resources. In order to explore the level of agricultural water saving in the farming-pastoral ecotone in north China, we took the farming-pastoral ecotone of Inner Mongolia as the research object. By combining analytic hierarchy process (AHP) with entropy weight method and fuzzy comprehensive evaluation, representative indicators reflecting the characteristics of agricultural water use in the agro-pastoral ecstatic zone were selected to construct an agricultural water-saving comprehensive evaluation system, and a comprehensive evaluation of agricultural water-saving in the agro-pastoral ecstatic zone in Inner Mongolia in 2020 was carried out. The results showed that there was a great difference in agricultural irrigation water consumption among counties in the agro-pastoral ecotone of Inner Mongolia, and the overall trend was higher in the east than in the west. The irrigation water consumption ranged from 582.41 m³/hm² to 4 905.86 m³/hm², and the utilization efficiency of irrigation water ranged from 51% to 84%. The comprehensive evaluation score of agricultural water-saving irrigation in all counties was between 2.26 and 3.67, and the overall water consumption level was above average. In 29 counties, good proportion was 44.80%, and medium proportion was 55.20%. Compared with crop water use efficiency (WUE), the constructed comprehensive evaluation system can more truly reflect the actual situation of agricultural water use in the farming-pastoral ecotone. The areas with medium level of agricultural water-saving irrigation still need to develop water-saving measures to improve the utilization efficiency of agricultural water resources.