Landscape is one of the five core elements in the recognition of important agricultural cultural heritage. Clarifying the impact of important agricultural cultural heritage recognition on regional farmland landscape changes is an important foundation for the protection and utilization of heritage site landscapes. This paper used geospatial information graph, landscape transfer matrix, landscape pattern index, and unit area equivalent factor method to compare and analyze the evolution characteristics of farmland landscape before and after recognition, as well as the changes in ecosystem service value brought about by it. Then, a multiple logistic regression model was used to explore the impact of important agricultural cultural heritage recognition on changes in farmland landscape. The main research conclusions were as follows: (1) from 2000 to 2020, the cultivated land area in Aohan Banner decreased first and then increased, with a net decrease of 334.24km² before recognition, and a net decrease of 105.87km² (31.67%) in the agricultural cultural heritage protection and development demonstration zone. After recognition, the net area increased by 29.47km², of which 57.34% (15.81km²) were from the agricultural cultural heritage protection demonstration zone. (2) The recognition of important agricultural cultural heritage has led to a more regular shape of cultivated land landscape, enhanced connectivity and uniformity, and improved regional ecosystem service functions. (3) The recognition of important agricultural cultural heritage was an important factor affecting the landscape changes of farmland in Aohan. The ratio of landscape changes in farmland in the agricultural cultural heritage protection and development demonstration zone was low, and the intensity of farmland protection was high. In addition, the landscape changes of cultivated land were also influenced by natural geographical factors, location factors, and socio-economic factors. This study has revealed the impact of important agricultural cultural heritage recognition on changes in farmland landscape, which can provide new ideas for monitoring and evaluating agricultural cultural heritage.