As a novel financing approach, the agricultural supply chain finance mode still has some limitations in the income distribution mechanism. Given this, this article constructs an improved interval Shapley value approach to investigate income distribution for agricultural supply chain finance. Further, risk factors and financing costs are introduced as the influencing factors of the income distribution with considering the actual situation. Also, the interval Shapley value approach is used to distribute the benefits among the agents of the agricultural supply chain. Additionally, combined with the proposed influencing factors, the distribution results are modified, simultaneously, it is calculated and given via the improved interval Shapley value method. Subsequently, the application example reveals that the improved income distribution mechanism can not only be more scientific but also improve the stability and enthusiasm of the agricultural supply chain finance alliance, which has more advantages in reality.