This utility model relates to a cervical spine support pillow for preventing displacement while lying supine. It includes a first pillow body that engages with the head; a second pillow body detachably positioned at the center of the upper side of the first pillow body to engage with the neck; and detachable limiting pillow bodies on the left and right sides of the second pillow body. A third pillow body detachably positioned on the front side of the first pillow body to engage with the shoulders. First fixing straps extend outward from the outer sides of the limiting pillow bodies, with hook-and-loop fasteners at their ends. A pair of second fixing straps are provided on the top and front surfaces of the left and right sides of the third pillow body, with hook-and-loop fasteners at their ends. It is simple to operate, convenient to use, and suitable for various patients.