Wood drying equipment to achieve the forced drying of wood, must have three basic functions: heating, humidity and ventilation. The heating function is self-evident; Humidification (steam spray or mist water) is used to ensure the high humidity environment required for certain stages of drying, to prevent wood cracking, deformation, etc.; The ventilation equipment must ensure that the hot and humid air passes evenly through all parts of the pile, so that the moisture content of the dried wood is uniform. Simple wood "oven" is generally heated directly or indirectly by hot furnace gas, it is difficult to organize a reasonable airflow cycle, humidity is difficult to adjust or can not adjust, it is very difficult to get a good drying effect with this simple equipment.