The invention provides a method for quickly dehydrating and drying instant rice. The method comprises the following steps of: (1) washing and soaking raw rice; (2) cooking; (3) cooling and dispersing rice grains; (4) frying at low temperature in vacuum; (5) removing oil; and (6) cooling and packaging. The method has the following beneficial effects: the dehydrated rice prepared by the method has high rehydration speed, high rehydration ratio and low required cost; and the method is suitable for industrial production.