The utility model relates to an environmental engineering field, in particular to a biological densification device for high salt organic chemical industry waste water. The device includes the quenching and tempering pond in proper order, hydrolysis -acidification pool, biochemical pond, and sedimentation tank, be equipped with the waste water elevator pump on the pipeline between quenching and tempering pond and the hydrolysis -acidification pool, install the diversion ware on the pipeline before the water inlet of waste water elevator pump, hydrolysis -acidification pool is seal structure, the hydrolysis -acidification pool top is equipped with the pulse water -locator and the mouth is collected to waste gas, the one end of pulse water -locator is deepened the hydrolysis -acidification pool bottom and is connected with and is umbellate water distributor, the delivery port and the pulse water -locator tube coupling of waste water elevator pump, be equipped with electric -magnetic flow meter on this section pipeline, install in the biochemical pond to revolve and mix aerator and the biological carrier of strip belt, the sedimentation tank outer joint has the sludge pump, the import of sludge pump is linked together bottom the sedimentation tank. Adopt this device to carry out waste water treatment, can accomplish the purpose to containing high salt organic chemical industry waste water treatment discharge to reach standard.