The invention provides a flare gas safe recovery and discharge system, which comprises a flare gas delivery flask (2), an automatic control water-sealed valve (3), a gas holder (6) and a flare tip (13) and is characterized in that the gas inlet end of the flare gas delivery flask (2) is connected with a flare gas source by a flare gas main pipe (1); one path of the output end of the flare gas delivery flask (2) is connected with a gas torch (6), and the other path thereof is connected with the flare tip (13) via the automatic control water-sealed valve (3); an automatic control valve (4) and a flare gas filtering tank (5) are mounted on the pipeline connecting the flare gas delivery flask (2) with the gas torch (6); the output end of the gas torch (6) is connected with a compressor (7); and the output end of the compressor (7) is connected with a gas appliance (8). The invention has the advantages of simple system structure, convenient manufacturing and installation and safe usage; and the invention also has the characteristics of being favor of preventing environment, saving energy and the like.