In the context of the focus of poverty governance in China shifting from eradicating absolute poverty to alleviating multidimensional poverty after comprehensive poverty eradication, this paper incorporates demographic aging, demographic feminization, and Land lease into the analytical framework based on the demographic perspective. Based on the 2018 China Family Panel Studies (CFPS) sample survey data of 5,760 farm households, the impact of demographic structure on multidimensional poverty alleviation is empirically analyzed using the least squares (OLS) model. Attention is also paid to the heterogeneity of different regions and incomes on the alleviation of multidimensional poverty, and the logit model is applied to test it. The conclusions of the study are as follows: (1) Demographic aging has a significant negative effect on multidimensional poverty alleviation. Demographic feminization has a significant positive effect on multidimensional poverty alleviation. (2) Demographic aging has a significant contribution to Land lease and helps alleviate multidimensional poverty. (3) Demographic aging has a significant negative effect on multidimensional poverty alleviation in the eastern region, and demographic feminization has a significant positive effect on multidimensional poverty alleviation in the central region. (4) Demographic aging has a significant negative effect on multidimensional poverty alleviation in the low-income group.