Agricultural cultural heritage is cultivated by nature and human farming civilization together, and the historical and cultural values it contains still affect the survival and development of human beings; so, it is important to protect agricultural cultural heritage and promote its sustainable development. This paper reviews, collates, and summarizes the research on agricultural cultural heritage and sustainable development of tourism by scholars and experts at home and abroad, and on the basis of relevant theories and with reference to previous research results, adopts hierarchical clustering algorithm to cluster and decompose the attractions preferred by tourists, and then uses the improved density method to search for nearby attractions that meet the requirements in different regions with different search radii, so as to provide tourists with optimal tourism planning and thus provide the optimal tourism planning for tourists. The evaluation index system of sustainable development potential of agricultural cultural heritage tourism is established from four aspects: sustainability of heritage resources, sustainability of tourism environment, sustainability of tourism economy, and sociocultural sustainability. The evaluation index system and evaluation criteria of sustainable development potential of agricultural cultural heritage tourism established in this paper have certain reference value and universality for most agricultural cultural heritage.