Waste heat recycling and reusing drying system

The invention discloses a waste heat recycling and reusing drying system, and relates to the technical field of drying equipment, the waste heat recycling and reusing drying system comprises a drying chamber, one end of the drying chamber is connected with the rear end of an air inlet pipe, and the other end of the drying chamber is connected with the front end of an air outlet pipe; the front end of the air inlet pipe is communicated with an external air source through an air inlet pump, and a geothermal energy air heat exchanger, a waste heat exchanger and a heating device are sequentially connected to the portion, between the air inlet pump and the drying chamber, of the air inlet pipe in series from front to back. Cold air newly entering the air inlet pipe can conduct heat exchange with underground water in the heat exchange water pipe in the box body of the geothermal energy air heat exchanger, and first preheating operation is conducted. And the air subjected to the first preheating operation enters the