The invention discloses a corrosion-resistant automobile tail gas muting device. The corrosion-resistant automobile tail gas muting device comprises a protective cover, an air inlet pipe, an air outlet pipe, heat dissipation fins and a main cavity; through holes are formed in the protective cover, and the protective cover is fixed to the outer side of the main cavity through the heat dissipation fins; the left end of the main cavity is connected with the air inlet pipe through a front cover, and the right end of the main cavity is connected with the air outlet pipe through a back cover; and a first partition plate, a second partition plate and a third partition plate are sequentially arranged in the main cavity from left to right, a ternary catalytic gauze C is installed between the first partition plate and the second partition plate, a first ventilation pipe is fixed to the upper middle of the first partition plate, the upper middle of the second partition plate and the upper middle of the ternary catalytic gauze, a ternary catalytic gauze A is installed between the second partition plate and the third partition plate, and a second ventilation pipe is fixed to the middle of the second partition plate, the middle of the third partition plate and the middle of the ternary catalytic gauze A. The corrosion-resistant automobile tail gas muting device has the advantages of being simple in appearance, good in noise reduction and heat dissipation effect, steady in structure and capable of catalyzing automobile tail gas to prevent noxious substances in the tail gas from entering the air.