The utility model relates to an eccentric corrosion-resisting butterfly valve comprising a valve body, a valve disc, a valve rod, a valve seat ring and a valve seat ring pressing plate. The eccentric corrosion-resisting butterfly valve is characterized in that the section of the valve seat ring is groove-shaped, the inner end, namely the plane end, of the valve seat ring is embedded on the valve body, the outer end, namely the concave surface end, of the valve seat ring is higher than the end surface of the valve body and is embedded on the valve seat ring pressing plate matched with the valve seat ring, a boss on the valve seat ring pressing plate is inserted in a groove of the valve seat ring, and a meshed structure is formed between the valve seat ring pressing plate and the valve seat ring. The eccentric corrosion-resisting butterfly valve has the characteristics that the valve seat ring is designed to be groove-shaped, is embedded on the valve body and the valve seat ring pressing plate simultaneously and forms meshed sealing with the valve seat ring pressing plate, thus being reliable in sealing, not easy to deform, simple in structure, convenient to process, and easy to install and replace.