The invention belongs to the technical field of processing of agricultural products and relates to a device and a method for drying poria cocos by controlling temperature and controlling humidity. The device for drying poria cocos by controlling the temperature and controlling the humidity is mainly used for drying and processing the poria cocos. The device comprises a drying box (1), a hot air circulating unit, a hot air humidifying unit, a water supplying unit and a control unit, wherein the hot air circulating unit, the hot air humidifying unit, the water supplying unit and the control unit are coupled on the drying box (1) so that the temprature, humidity and air speed of circulating hot air in a drying chamber (31) can be effectively controlled. The device and the method have high efficiency and are convenient to use; the temprature and humidity can be effectively adjusted when the poria cocos is dried; the drying speed is fast and obtained poria cocos dices have a large compacting degree, are not easy to damage and have white texture; the condition is better, the defective rate is low and the loss of nutrients is less; the later storage, transportation and processing are easy to realize, and water conservation, energy conservation and environment protection are realized; automatic control can be realized.