Special preheating drying tower for casting waste sand

The utility model discloses a preheating drying tower special for casting waste sand, which comprises a drying tower main body, and supporting legs are respectively fixed at four corners of the bottom end of the drying tower main body. According to the preheating drying tower special for the casting waste sand, when the drying tower is used for drying the waste sand, hot air can be upwards introduced into the drying tower main body from the bottom of the drying tower main body through an air inlet pipe, and then a first driving motor can be controlled to start to drive a rotating shaft to rotate; the rotating shaft rotates to drive the multiple sets of crushing blades fixed to the top end and the bottom end to rotate at the same time, then waste sand is guided into the treatment box through the connecting pipe, the rotating crushing blades can conduct auxiliary crushing on some caked large blocks in the waste sand, and then the waste sand is guided into the drying tower body through the sand inlet to be dried