The invention provides a high-performance environment-friendly aqueous film-forming foam extinguishing agent which comprises the following components in percentage by weight: 3-6% of a fluorine-containing surfactant, 3-20% of a carbon hydrogen surfactant, 3-6% of an organosilicon surfactant, 0.1-4% of plant polysaccharides, 8-20% of a solubilizer, 0.1-4% of an ion complexing agent, 0.1-2% of an antibacterial agent and the balance of water. Under interactions of the components of the contents, the extinguishing agent has an excellent fire extinguishing function and is good in foam performance,high in fire extinguishing efficiency, rapid in fire extinguishing speed, good in after-combustion prevention and sealing performance, long in preservation life, easy in raw material obtaining, environment-friendly and easy in biodegradation, free of PFOS (perfluorooctane sulfonates) or salts thereof, and free of environment pollution; and under a condition that the foam expansion rate is 7.3-8.1,the 25% drainage time of the extinguishing agent is 3.4-4.1 minutes, the fire extinguishing time (compulsive application) is 35-47 seconds, and the burning resistance time (compulsive application) is13.1-17.4 minutes.