The invention relates to a big data sitting posture memorizing and adjusting method. The method comprises the following steps: acquiring current body weight data and current sitting posture data, storing the data into a storage device, and establishing a relation between the current body weight data and the current sitting posture data; carrying out comparison when a user sits again; controlling an adjusting device of a chair according to proximate sitting posture data to adjust the chair, and adjusting the sitting posture of the user to meet an acceptable sitting posture distance range; transmitting the body weight data, the sitting posture data and the relation to a big health sitting posture database server; and online automatically adjusting the chair to adjust the sitting posture of the user to a common sitting posture state, meeting a standard sitting posture range, of the user. By virtue of memorization of a big health sitting posture database, the body weight data and the current sitting posture data of the user are compared and are adjusted in real time, so that the user can enjoy the same sitting posture adjustment effect on different intelligent health chairs.