The dust collector hot air recycler works with ground dryer (can also be used with a spiral mixing dryer), so that the hot air forms a semi-closed loop loop, the hot air released from the drying exhaust port holds moisture and dust, the moisture released from the heated natural steam, the remaining hot air into the recycler is completely filtered, the clean and dry hot air from the recycler comes out and then through the heat resistant air tube into the wind mill into the dryer, and then repeatedly used.