The invention discloses an internally-embedded type ammunition electromagnetic catapulting device on an unmanned helicopter. The device comprises ammunition guide rails, an electromagnetic guide rail and armatures arranged on ammunition. The ammunition guide rails are used for installing and transporting the ammunition. The electromagnetic guide rail comprises two sliding rails with strong electrical conductivity and is used for pushing the ammunition to be separated from the unmanned helicopter downwards along the sliding rails. The armatures have the electrical conductivity and are used for making contact with the two sliding rails on the electromagnetic guide rail when the ammunition enters the electromagnetic guide rail, a closed loop is formed, and therefore a magnetic field is generated between the two sliding rails. Current passes through the armatures, the armatures with the current bear the ampere force in the vertical direction under the effect of the magnetic field, the ammunition is controlled to pop up under the double effects of the ampere force and the gravity, and the amplitude and the direction of the ampere force can be adjusted and controlled according to specific conditions.