The invention discloses a fly ash drying machine. The fly ash drying machine comprises a drying kiln which is arranged in an inclined mode. The high end of the drying kiln is a feed end, and the low end of the drying kiln is a discharge end. A riding wheel device is arranged on the portion, close to the feed end, on the drying kiln. A riding wheel blocking device is arranged on the portion, close to the discharge end, on the drying kiln. A transmission device is arranged in the middle of the drying kiln. A heating device is connected to the feed end of the drying kiln. A discharge device is arranged at the discharge end of the drying kiln. The discharge device is connected with a cyclone separation device which is connected with an induced draught fan. Unique design is adopted for the fly ash drying machine according to the characteristics of fly ash, and the pollution and treatment problem of fly ash is solved; meanwhile, waste fly ash is turned into wealth, and economic benefits are increased.