The invention provides a multi-agent system-based active power control method for an autonomous AC/DC micro-grid. The method comprises the following steps: (1) building an agent model, building a multi-agent system for the autonomous AC/DC micro-grid, enabling various entity agents to communicate with one another and obtaining power values of various agents in the next period of time; (2) judging whether power generation of renewable power supplies is sufficient or not in the micro-grid in the next period of time; (3) if the power generation of the renewable power supplies is not sufficient, carrying out economic dispatching conventional power smoothing short-term power balance; and (4) if the power generation of renewable power supplies is sufficient, calculating the power generation utilization rates of the renewable power supplies by a subgradient optimization algorithm. The active power control method solves the problem of convex optimization in coordinated control of the autonomous micro-grid and the problem of coordinated operation of distributed power supplies in the autonomous micro-grid, and improves the stability and the reliability of the micro-grid in autonomous operation.