It is key to establish a fair mechanism of interest allocation to solve the social contradictions and conflicts, which are mainly caused by the imbalances of interests between social groups. Analyzing the flexibility exhibited by ant colony’s labor division in task allocation, the paper proposes to achieve interests allocation flexibility by learning from task allocation flexibility. First, the concept of interests is defined from the perspective of allocation, and the formal description is given, where the relative deprivation is introduced to measure the fairness of interests allocation. Second, the basic ant colony’s labor division model is extended according to the characteristics of social groups’ interests, using the recovery factor to coordinate different social groups, then the ant colony’s labor division model for interest allocation is built, and its algorithm implementation process is presented. Third, simulation experiments are performed on a representative example of interests allocation, and the validity of the proposed model is verified from two aspects: The recovery and allocation flexibility. The simulation results show that the capability to realize interests plays a leading role in the interest allocation process; in the case of unfair allocation of interests, the recovery factor is effective for the recovery and shows allocation flexibility in dynamic environments. Finally, the evolutionary process of the interests-based group event is described, where the recovery is quantitatively analyzed and the evolution law of the interests-based group event in reality is expounded.