The invention discloses a tail gas treatment cracking device. The tail gas treatment cracking device includes a fan, a shell, a corrugated pipe, a base, an exhaust pipe, a three-way pipe, a one-way valve, a base plate, an exhaust passage, a ceramic fiber heater, an exhaust gas combustion chamber and an insulating layer. According to the tail gas treatment cracking device, the height between the base and the base plate can be adjusted, so that the height of the corrugated pipe is adjusted, thus the connection between the corrugated pipe with an exhaust port of a degreasing furnace is facilitated, the using difficulty of the tail gas treatment cracking device is reduced, so that the corrugated pipe can be matched with different models of degreasing furnaces for use, the heights of exhaust ports of the different models of degreasing furnaces are different, the using flexibility of the tail gas treatment cracking device is higher, the tail gas treatment cracking device has a wide application range, and the practicality of the tail gas treatment cracking device is improved; and according to the tail gas treatment cracking device, the flow path of exhaust gas in the exhaust gas combustion chamber can be increased through baffle plates, the flow velocity of the exhaust gas in the exhaust combustion chamber can be reduced, so that the combustion of the exhaust gas in the exhaust gas combustion chamber is more fully, and thus the effect of exhaust gas treatment is improved.