The invention relates to the field of metal pressure machining, in particular to a temperature-controllable self-positioning bar hot rolling transportation roller way. The temperature-controllable self-positioning bar hot rolling transportation roller way comprises a water inlet pipe, a water inlet tank, a water tank sealing ring, a fixed end bearing seat, a V-shaped roller way, a water outlet tank, a water drainage pipe, a transmission end bearing seat, a cooling pipeline, water drainage holes and a base, wherein the water inlet tank and the fixed end bearing seat are installed at the non-transmission end of the roller way and fixed to the base, the water inlet pipe is installed on the water inlet tank, and the water inlet tank and the roller way end are assembled in a sealed mode; and the roller way surface is sunken. The water outlet tank and the transmission end bearing seat are installed at the roller way transmission end and fixed to the base, the water drainage pipe is installed on the water outlet tank, the water drainage holes are formed in the roller way transmission end, and are sealed in the water outlet tank; and due to the fact that the inclination angle exists in the roller way surface, bars are automatically centered to a center area of the roller way surface in the conveying process, the bars are prevented from touching the two sides of the roller way, and uneven abrasion to the roller way surface is reduced.