The invention discloses an automatic adjusting method of a bed. The automatic adjusting method comprises the following steps of obtaining basic information of a user, wherein the information comprisesthe age, gender, height, weight and body figure of the user; obtaining sleeping information of the user, wherein the sleeping information comprises the pressure or pressure distribution to the body back of the user under the conditions of different comfortable sleeping gestures, wherein the sleeping gestures comprise lying on the back, left side lying, right side lying, and lying on the stomach;according to the basic information and the sleeping information of the user, establishing a body model and a sleeping pressurizing model for the user; identifying the user on the bed and the sleepinggesture. The automatic adjusting method of the bed has the advantage that the stored programs can be called up to truly realize the automatic adjusting function.