Corrosion-free energy-saving chimney

The utility model discloses a collision-free energy-saving chimney, comprising a chimney cylinder (1) and a flue gas inlet channel (2), wherein the lining (1a) of the chimney cylinder (1) is provided with a helical flue gas guide line (3); the lower end of the chimney cylinder (1) is equipped with a flue gas inlet (10); one end of the flue gas inlet channel (2) is connected to the flue gas inlet (10) and communicated with the inside of the chimney cylinder (1) through the flue gas inlet (10); the helical flue gas flow guide line (3) is formed by piling a plurality of building blocks (4) with flow guide parts (41); the flow guide part (41) of each building block (4) has a smooth inclined surface (41a), so that the inclined surfaces (41a) of all the building blocks (4) piled together are in smooth connection, and a flow guide surface (31), on which flue gas raises in a rotatable manner, is formed. Application of the chimney disclosed by the utility model can reduce energy consumption of a fan by about 20%, is g