The invention discloses a processing method for drying a medicinal material radix astragali by microwave and infrared combination, aiming at the technical problems in the prior art that not only is the quality of medicinal materials affected but also various harmful substances can be brought in when traditional Chinese medicines are fumigated with sulfur. The method comprises the following steps: impurity removal, grading according to the size, smoothing straight, microwave drying, chilling, infrared drying, chilling, tidying, binding and tying and subpackaging. The method can achieve the aim of drying the medicinal material radix astragali faster. Compared with traditional methods, the method has the beneficial effect that the moisture content of the medicinal material can fast reach the limit stipulated in Chinese Pharmacopoeia on the basis of not reducing the main ingredients of the medicinal material. Compared with a sulfur fumigation method, the method has the beneficial effect that the harmful substances are prevented from being brought in. Meanwhile, the method has the beneficial effects that the medicinal material radix astragali has obvious effects on improvement of immunities of mice; mildewing, damages caused by worms and other phenomena are not easy to happen in the storage process; the stability of the quality of the medicinal material radix astragali is ensured; radix astragali processing is more normalized through tidying and subpackaging, thus improving the quality controllability of the medicinal material radix astragali.