The present invention relates to a portable self-resisting exercise machine for strengthening the cervical spine flexion muscle, and more particularly, to a self-resilient exercise machine for strengthening the cervical spine flexion muscle, The neckband is provided in a mounting groove of a neck band so that a user's jaw can be brought into contact with the neck of a user when the neckband is installed on the user's neck. A signal portion provided at one side of the inner side of the neck band for signaling when power is supplied to one end of the neck portion and connected to the other end of the signal portion； And a power source provided on one side of the neck band by supplying power to the signal unit, A lower socket having one end coupled to one side of the upper surface of the receiving plate and a lower socket having one end penetrating through the lower socket, And an upper socket having one end fixed to the other end of the lower socket and the other end of the elastic body being seated in a space inside the other end of the elastic body, Wherein one end of the signal portion is coupled to one end of the lower socket at a predetermined distance from each other so that when the upper portion of the neck portion moves downward by the jaw of the user, And one end of the upper socket is inserted into a space between the double walls of the lower socket In contact with one end of the power supply and the negative signal it is characterized in that the power of the power which the signal generated is transmitted to said signal. The present invention also relates to a self-motion method using a portable self-resisting arm for strengthening the cervical deep-flexion muscles, and more particularly, to a self-exercise method using a lifter for strengthening the deep- A neck portion in which a mounting groove is formed in one side and a neck portion in which an upper portion is moved upward and downward by movement of a user's jaw provided in a mounting groove of th
