The invention discloses a salt-containing waste water efficient denitrification method. The method comprises a middle water tank, a primary denitrification filter tank, a secondary denitrification filter tank and a clear water tank connected in series. An acid is added into the salt-containing waste water in the middle water tank and adjust pH and basicity, a carbon source and a phosphorus sourceare added into the salt-containing waste water, the salt-containing waste water is fed into the primary denitrification filter tank and is subjected to primary denitrification so that most of nitrogennitrate and nitrogen nitrite in the salt-containing waste water are removed, product water in the primary denitrification filter tank is subjected to basicity adjustment, is supplied with a carbon source, then is fed into the secondary denitrification filter tank and is subjected to secondary denitrification so that the remaining nitrogen nitrate and nitrogen nitrite are further removed, the backwashing water in the primary denitrification filter tank and the secondary denitrification filter tank is subjected to coagulation and sedimentation, then is returned into the middle water tank and then is treated, and the product water in the clear water tank is partially returned into the middle water tank. Through the efficient denitrification process in the primary denitrification filter tankand the secondary denitrification filter tank, efficient denitrification of salt-containing waste water is realized and nitrate and nitrite removal efficiency is 95% or more.