The invention relates to a retractable and adjustable heating brace. Primarily, a main body is provided with a tie portion, retractable portions and assembly portions. A heating piece is disposed within the tie portion, and the assembly portion is provided with a temperature controller. Furthermore, a first conductive wire is connected to the heating piece at one end thereof and to the temperature controller at the other end thereof by extending through the first, second and third spaces, wherein the length of the first conductive wire located in the retractable portion is larger than the length of the retractable portion. Thereby when the user ties the main body around his or her waist by pulling the retractable portion thereof, the length of the first conductive wire can be stretched appropriately according to the stretch of the retractable portion. Accordingly, it can prevent the first conductive wire from break or damage.
