The invention relates to a hypersonic bullet-case-free explosive bullet emission gun. Bullet and shell propellant powder is an explosive mixture, the initial speed is 3500 m/s or above, bullets are in three specifications including the short specification, the middle specification and the long specification, and the bullets in three length specifications can be emitted. The effective firing range is 1000 m, 2000 m or 3000 m, and the bullets can penetrate several persons, common single walls, card, aircrafts and the like. According to an overlength bullet long distance antiaircraft machine gun, the effective firing range is 8000 m, and the caliber can be 20 mm. A laser ranging instrument and a telescope sighting device are arranged, long distance shooting is achieved, shooting earlier to an enemy is carried out, and long distance enemy destroying is achieved. According to task requirement, bullet clamps for the bullets in three length specifications including the short specification, the middle specification and the long specification can be replaced in good time, and multiple functions are achieved through one gun. An arc-shaped front thrust cap is installed on a muzzle, a back front thrust rod device is installed on a butt, and mechanical recoil of the front portion and the back portion of the muzzle is offset. Recoil is avoided in the shooting process. The shooting accuracy is improved, and operation is simplified.