The present invention relates to a solar dryer, which belongs to the field of new energy utilization. At least one material drawer is arranged in a drying box, a preheating air channel baffle is arranged between the rear wall of the drying box and the material drawer, the preheating air channel baffle and the drying box form a preheating air channel, a waste heat recovery heat exchanger is arranged under the material drawer, and the part of the drying box opposite to the waste heat recovery heat exchanger is provided with a fresh air inlet channel; and the lower end of a two-section finned heat tube is provided with a heat collection glass tube, the upper end of the two-section finned heat tube is arranged in the drying box, and the part of the two-section heat tube in the drying box is provided with fins. The solar dryer has a high drying speed and can save time; the solar dryer can also be prevented from being contaminated by insects and is clean and sanitary; and food can be dried at an appropriate temperature and within a shorter time, the nutritional value of the food can be preserved to the largest extent, and thus the food is conducive to health. The solar dryer fully utilizes waste heat in the whole drying process, and can not only provide hot water for the daily life of families, but also can be used for drying agricultural and sideline products. Moreover, the solar dryer can realize energy conservation and environmental protection, and can also reduce the drying cost.