Silicon tetrachloride tail gas treatment device

The invention provides a silicon tetrachloride tail gas treatment device. The treatment device comprises a first reactor, a second reactor and a third reactor, wherein the first reactor is used for reacting silicon tetrachloride tail gas with excessive alkali liquor to obtain a first reaction product containing silicate and pypocholoride; a solid-liquid separator which is communicated with the outlet of the first reactor and is used for carrying out solid-liquid separation on the first reaction product to obtain a separation liquid; a second reactor which is communicated with the outlet of the solid-liquid separator and is used for enabling pypocholoride and a reducing agent to be subjected to oxidation-reduction reaction to be converted into chlorine salt so as to obtain a second reaction product; an acid-base neutralization device which is communicated with the outlet of the second reactor and is used for mixing acid liquor with the second reaction product to neutralize excessive alkali liquor. When the device is used for treating the silicon tetrachloride tail gas, the hypochlorite in the eluted waste alkali liquid can be treated by using reducing agents such as sodium sulfite and the like, so that the chlorine gas generated by the hypochlorite in an acid environment is prevented from being gathered at the lower part of equipment or a pipeline, and the potential safety hazard of production is reduced.