The utility model discloses a tail gas negative pressure absorption emission reduction system in titanium tetrachloride production. The tail gas negative pressure absorption emission reduction system comprises a boiling furnace, a dust collector, a partition plate separator, a water curtain dust remover and a leaching tower. The tail gas negative pressure absorption emission reduction system has the characteristics of reasonable design, multi-stage multi-section separation, high impurity removal efficiency and less environmental pollution; the dust remover and the partition plate separator can be used for removing large-diameter granular impurities; the water curtain dust remover can be used for absorbing most of hydrogen chloride gas and titanium tetrachloride in dissolved tail gas; a cycle separator can be used for separating smaller solid granules from liquid drops in the tail gas; the leaching device can be used for harmlessly treating hydrogen and hydrogen chloride; a negative pressure fan can be used for enabling the tail gas to automatically flow in the system to avoid leakage of pollutants caused by contact between the tail gas and the air; and the finally discharged tail gas treated with the system can reach the national discharge standard. The tail gas negative pressure absorption emission reduction system overcomes the shortage of the conventional titanium tetrachloride tail gas treatment device and has a good social benefit.