The invention discloses a heat treatment method for the X80 bent pipe welding joint with the excellent low-temperature toughness. The heat treatment method comprises the following steps of firstly, carrying out three-wire two-layer two-pass welding on the X80 pipeline steel by adopting a standard submerged arc welding wire to obtain a straight weld joint welding joint; secondly, the obtained straight weld joint welding joint is subjected to normalizing heat treatment through a high-temperature induction heating furnace, heat treatment is carried out at the same time, direct air cooling is conducted, and a bent pipe welding joint is obtained; and finally, the obtained bent pipe welding joint is placed in a box-type resistance furnace, and heat treatment is carried out again and air-cooled to room temperature. Compared with the prior art, the method is simple and easy to operate, the operation flow is simplified, the mechanical property reduction caused by heating bending of the X80 bentpipe welding joint is greatly improved, the low-temperature impact absorption work at the X80 bent pipe is guaranteed, the tensile elongation is good, and the yield strength and the tensile strengthare higher.