The invention relates to a fast reactor sodium fire accident smoke-extraction ventilation method and system equipment. The ventilation system equipment comprises electric fireproof valves (1), (2) and (3), a water-bath washer (4), an air pre-filter (5), a high efficiency air particle filter (6), a fan (7), an electric closed valve (8), a dosage monitoring instrument (10) and a differential pressure measurement instrument (9). Sodium smoke goes through the water-bath washer so that sodium oxide in air is transformed into sodium hydroxide alkali lye, radioactive aerosol in air is removed by the air pre-filter and the high efficiency air particle filter so that purifying efficiency is 99.99%, and harmful substances in the sodium smoke are relatively completely adsorbed and removed and then the smoke is discharged into the environment.