The invention discloses a method for inhibiting blue algae from growth by using plant fallen leaves. According to the method, a plant fallen leaf leach solution is added into a fresh water system containing blue algae, so that the chemical sensitive substances contained in the plant fallen leaf leach solution can effectively inhibit the blue algae from growth, thereby achieving the goal of controlling the blue algae from overgrowth. The method is simple and easy to implement, simple to operate and low in treatment cost, implements control on the excessive reproduction of the typical algae of the fresh water system, ensures the safety of the fresh water system environment, and has wide application prospects for controlling the algal bloom of the blue algae.