Drying machine waste gas conveying device

The utility model relates to the field of sludge drying, in particular to a drying machine waste gas conveying device which comprises a sludge drying machine. The waste gas conveying mechanism is used for conveying and discharging waste gas in the sludge drying machine, and the waste gas conveying mechanism is mounted on the rear side of the sludge drying machine; when the sludge drying machine exhausts waste gas, the waste gas firstly enters the heat exchange copper pipe through the exhaust pipe to heat the heat exchange copper pipe, the heat exchange copper pipe is in contact with water in the heat exchange water tank during heating to exchange heat in flue gas, so that the water is heated by the heat, and when the water reaches a preset temperature, a first water pump is started to work; the first water pump is communicated with the water inlet pipe to pump hot water in the inner cavity of the heat exchange water tank, and the hot water is directly discharged into a heat exchanger in the sludge drying mach