The structure of the parallel gap is simple. However, after the lightning strike, the arc caused by the power frequency continuous flow cannot be extinguished quickly, so the tripping rate of the line rises. A new integrated lightning protection gap is proposed, which uses magnetic energy air blowing device to spray high-energy air flow acts on the gap arc, causing it to quickly extinguish the arc, and accelerate the dissipation of arc energy, while quickly thinning the gap arc, cutting off the power frequency current, and achieving the goal of rapid arc extinguishment. Based on the theory of magnetohydrodynamics (MHD), a finite element simulation analysis software is used to construct the theoretical model, and AC arc extinguishing experiments are conducted. The research results show that the integrated lightning protection gap based on the principle of air blowing can reduce the arc column temperature of the arc to 1/5 of the original in a short time, blow the arc to 30% of the original, and make the arc extinguishing time no more than 5 ms, which is only 6%~8% of the traditional protection gap extinguishing time. The proposed method greatly shortens the extinguishing time of gap power frequency continuous current arc, and ensures the power supply reliability of the power system.