The present invention relates to an automatic inflatable fastening device of a torpedo structure for collecting marine sedimentation debris, comprising: a first body provided in a cylindrical shape; Wings provided in a blade structure formed over the upper and lower surfaces of the first body portion on the outer peripheral surface of the first body portion formed at equal intervals to each other along the circumferential direction of the outer peripheral surface of the first body portion is provided with at least two; a connection part provided on an upper end of the first body part in a form that can be fastened or detached; and an expansion part covering the upper side of the connection part with a material that can expand or contract according to a change in the inner pressure level in a state in which the connection part is fastened to the first body part; a second body portion extending downward from the lower end of the first body portion in a cylindrical shape; and a hook portion provided in the form of a hook forming a locking structure toward the upper side, and at least two clasps provided on the outer circumferential surface of the second body portion.
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