The invention discloses a heat treatment method for an attachment weld between a hand hole pipe and an end cap of a pipeline. The hand hole pipe (2) is connected to an outer circumferential wall and/or an end wall of a blind end of the pipeline (1), a free end of the hand hole pipe (2) and the end cap (3) are connected by welding through the attachment weld (4). The heat treatment method comprises the following steps: S1, an outer end face of the end cap (3) is connected to an auxiliary pipe (6); S2, a heating element (9) is arranged and surrounds the periphery of the hand hole pipe (2), the end cap (3), and the auxiliary pipe (6); S3, the heating element (9) is started for carrying out heat treatment of the attachment weld (4). The end cap of the hand hole pipe is connected to the auxiliary pipe, so that the heating area of the attachment weld at one side of the end cap can be prolonged, so that the heating temperatures at double sides of the attachment weld are kept consistent, and heat treatment quality is improved.