The invention relates to the technical field of daily supplies, in particular to a multifunctional adjustable seat capable of dynamically protecting the spine, which comprises a base, a
cushion, a chair back and a headrest, the headrest is adjustably mounted on the chair back, and a cervical
vertebra supporting part is arranged on the headrest; a
lumbar vertebra supporting part and a thoracic
vertebra supporting part are arranged on the chair back; armrests are arranged on two sides of the
cushion and the chair back; a connecting seat and a supporting seat are arranged on the
cushion; a telescopic adjusting part is arranged between the chair back and the cushion; the chair back rotates in the front-back direction relative to the cushion; and when the chair back rotates, the chair back stretches out and draws back according to the position change of a user under the action of the telescopic part. And the
lumbar vertebra, the thoracic vertebra and the cervical vertebra of a user can be protected when the user works or relaxes. The chair back changes according to the change of tipping and height stretching of the back of the
human body, and any angle and height provide supporting force for the spine of the
human body to protect the spine of the
human body. Therefore, the chair is suitable for different people to use.