Automobile tail gas secondary purifying device and working process thereof

The invention provides an automobile tail gas secondary purifying device and a working process thereof. The automobile tail gas secondary purifying device comprises an exhaust guide tube, a power box and a tail gas treating fluid diversion cavity, wherein the inlet of the exhaust guide tube is provided with a gas cyclone; a wiring tube type plasma reactor is arranged in an exhaust guide tube channel; the outlet of the tail gas treating fluid diversion cavity communicates with four tangential rotational-flow slots to the outlet of the exhaust guide tube. According to the automobile tail gas secondary purifying device, the wiring tube type plasma reactor is adopted, a high-voltage alternating-current power supply is additionally arranged between a linear central electrode and an outer-layer tubular electrode, and a great number of low-temperature plasmas which are relatively uniform in distribution can be generated in a central cavity, so that the problem that the purifying efficiency is low due to the fact the