Air supply device for improving temperature distribution uniformity of heating furnace

The utility model discloses an air supply device for improving temperature distribution uniformity of a heating furnace. The air supply device comprises a plurality of fans and a plurality of shunting air boxes, the fan is mounted on the top surface of the heating furnace; the plurality of shunting air boxes are in one-to-one correspondence with the plurality of groups of heating wires, and the shunting air boxes are positioned right above the corresponding group of heating wires; the shunting air bellow comprises an air inlet pipe, an air cover, a shunting plate and an air outlet plate; the upper end of the air inlet pipe is communicated with an air outlet of the fan, and the lower end of the air inlet pipe is communicated with the top surface of the fan cover; the periphery of the air outlet plate is connected with the periphery of the bottom of the fan cover; the splitter plate is located between the top face of the air outlet plate and the lower end of the air inlet pipe. A plurality of first through hole