The invention discloses a method for rapidly and mildly extracting heavy metals from cereals. The method comprises the following steps: crushing a cereal sample, uniformly mixing the cereal sample with dilute acid, and extracting heavy metal ions; after oscillating and whirling, standing or centrifuging, wherein cadmium, lead and other heavy metal elements in the cereal sample are basically transferred to supernatant, and the obtained supernatant is used for detection. The invention finds and reports the method for the first time; compared with the conventional extraction method, the method provided by the invention has the advantages that the time consumption is short, a lot of corrosive reagents are not required, a high temperature and a specific instrument are not required, the method can be completed at a room temperature, the operation is simple, and rapidness and practicality are achieved; by the method, the problems of complicated and cumbersome pretreatment, long time consumption, poor environmental protection property, difficult on-site detection and the like, which exist in analysis on harmful elements of food and products of the food for a long time, are solved; in combination with the refined deep processing technology of the cereals, the method also can be used for technologically removing the heavy metals from the cereals with excessive heavy metal pollutants.