Drying machine waste heat recovery and utilization system and method

The invention provides a drying machine waste heat recovery and utilization system and a drying machine waste heat recovery and utilization method. The drying machine waste heat recovery and utilization system comprises an exhaust emission chimney, a water storage tank, a water drainage pipe, a spraying device, a rotational flow plate, a mesh mist eliminator, a water supplementing device and a hot water utilization device. According to the drying machine waste heat recovery and utilization system and the drying machine waste heat recovery and utilization method, water vapor in exhaust gas of a drying machine is turned into hot water to be recycled in a batching system, so that regeneration utilization of waste water is realized, energy and water resources are saved, the temperature of slurry can be raised, smooth operation of a drying process of a gypsum board is facilitated, energy consumption in the drying process is reduced, the production is benefited, and the production cost is lowered effectively.