Grain drying equipment

The utility model relates to grain drying equipment which comprises a heat pump condensation dehumidification unit for providing dry hot air and a tower type dryer, the tower type dryer is provided with a drying tank, a closed dynamic crystallization drying chamber is arranged in the drying tank, an air guide device is vertically arranged in the dynamic crystallization drying chamber, and the air guide device is connected with the drying tank. The air guide device is of a columnar structure with an inner cavity, and the air guide device is provided with a first air inlet; a second air inlet communicated with the dynamic crystallization drying chamber is formed in the lower end of the drying tank; the first air inlet and the second air inlet are connected with the air supply end of the heat pump condensation dehumidification unit in parallel. An air guide ring groove is formed in the circumferential wall of the dynamic crystallization drying chamber and used for cooperating with the air guide device to work. A