Flue gas recirculation device

The utility model discloses a flue gas recirculation device, which belongs to the flue gas circulation field and comprises a gas outlet pipe and a flue gas inlet pipe, one end of the gas outlet pipe and one end of the flue gas inlet pipe close to each other are arranged in a mixing box, a gas inlet plate is arranged on one side of an inner cavity of the mixing box, one side of the gas inlet plate is connected with a flue gas inlet piece, a transverse pipe is connected inside the flue gas inlet piece, and the transverse pipe is arranged in the mixing box. The transverse pipe is sleeved with the gas outlet pipe, the transverse pipe and the smoke inlet piece are each provided with a smoke opening, and the side, close to the transverse pipe, of the gas outlet pipe is connected with a length block. When air and smoke moving along the outer wall of the length block subsequently enter the space between the air outlet pipe and the inner wall of the smoke inlet piece, the air and the smoke are mixed with the fully-pav