The cervical spine assistive device is a supporting pad providing relaxation and rehabilitation to cervical spine. The cervical spine assistive device includes a semi-cylindrical base member having a saddle-shaped middle section conforming to the curvature of the cervical spine. A number of semi-spherical bulges are arranged on the middle section. The heights of the bulges gradually decrease from around the user's shoulder to the user's head so as to ensure contact and support from the neck to the head, achieving enhanced relaxation and rehabilitation.