The invention belongs to the field of designs of engine supporting structures and in particular relates to an axial anti-impacting device. The axial anti-impacting device comprise a rotary connectionbody, a fixed seat, a spherical ring and a swinging part, wherein the top of the rotary connection body is connected with an engine case; the fixed seat is provided with a square through hole; the bottom of the fixed seat is connected to a rack base; the spherical ring is provided with a first through hole which penetrating through a spherical center; the spherical ring is rotatably clamped in thesquare through hole of the fixed seat; the swinging part comprises a heavy hammer and a swinging rod; and one end of the swinging rod penetrates through a first through hole of the spherical ring andis hinged to the bottom of the rotary connection body, wherein the distance between the rotary connection body and the spherical ring is shorter than the distance between the spherical ring and the heavy hammer. The axial anti-impacting device provided by the invention is simple in structure; axial impact is effectively absorbed and heat expansion also can be absorbed; and an axial force and thermal stress are balanced and the problem of stress concentration is solved.