An external device for fixation of cervical vertebrae includes a waistcoat-shaped main body. The waistcoat-shaped main body includes a left part, a right part and polyurethane slurry. The left part and the right part respectively includes of two layers of knitting cloth and a cavity between the two layers of knitting cloth. The left part and the right part are filled with the polyurethane slurry. The left part and the right part are respectively provided with corresponding adjustable connecting structures. The external device for fixation of cervical vertebrae rapidly shapes according to human bodies and keeps the cervical vertebrae of patients in a proper position.
