Abstract: Based on the perspective of urban and rural labor mobility, this paper analyzes the internal logic of agricultural machinery socialization services to promote the integration development of urban and rural economy, and uses the panel data of 11 provinces and cities in the Yangtze River Economic Belt from 2012 to 2021 to empirically reveal the impact of agricultural machinery socialization services on the integration development of urban and rural economy. The results show that at the 1 % level, the socialized service of agricultural machinery has a significant role in promoting the development of urban and rural economic integration. Urban-rural labor mobility plays an intermediary role between agricultural machinery socialization service and urban-rural economic integration. The promotion effect of urban-rural labor mobility on urban-rural economic integration is affected by the single threshold effect of agricultural machinery socialization service. The higher the level of socialized service of agricultural machinery, the stronger the role of urban-rural labor mobility in promoting urban-rural economic integration. Therefore, the relevant suggestions are put forward to promote the construction of socialized service organization for agricultural machinery and orderly guide the flow of urban and rural labor force.