The invention discloses an acid-base-resistant chimney for a fireplace. The chimney is of a hollow cylindrical double-layer structure and is composed of an inner layer and an outer layer, a gap is reserved between the inner layer and the outer layer, the inner layer and the outer layer are connected at two ends, and the inner layer is an anti-corrosion layer. The inner layer is formed by carbon, silicon, manganese, sulfur, magnesium, zinc and the like according to a certain ratio. The chimney is arranged to be of a double-layer structure and is made of the specific materials according to a certain ratio, and therefore the chimney has the advantages that the acid-base resistance is high, the corrosion resistance is high and the service life is long.