To promote the recycling of agricultural organic wastes (AOWs), e.g., crop straws, and livestock and poultry (LP) manures, it is very important to analyze the demand-supply balance of the nitrogen nutrients converted from AOWs for agricultural utilization on a regional basis. Focusing on Shangshui County in central China’s Henan Province, this paper thoroughly analyzes this demand-supply balance through literature query and field survey. Firstly, the amount of nitrogen nutrients converted from the crop straws, and LP manures were calculated for the study area. Next, the demand for nitrogen nutrients of agricultural planting in the study area was estimated based on the soil properties and agricultural planting area. Based on the calculation results, the demand-supply balance of the nitrogen nutrients converted from AOWs for agricultural utilization in the study area was subject to quantitative analysis. The results show that: In 2017, the agricultural planting in Shangshui County demanded 35.16 kilotons of nitrogen nutrients; the total supply of nitrogen nutrients converted from AOWs stood at 25.86 kilotons, including 12.41 kilotons from crop straws (47.99%) and 13.45 kilotons (52.01%) from LP manures; the demand-supply ratio (amount of demand/supply quantity) of nitrogen nutrients was 1.36, that is, the demand surpassed the supply; therefore, the nitrogen nutrients provided by the AOWs in the study area can be fully utilized by the agricultural soil in the region.