Lifting type disc air spacer and using method thereof

The invention relates to a lifting type disc air spacer which comprises an upper disc, a lower disc, a supporting cylinder, a hanging ring, a traction rope and fixed catapulting devices. The supporting cylinder is fixedly connected between the upper disc and the lower disc, the multiple fixed catapulting devices are arranged on the upper surface of the upper disc, the center of the upper disc is connected with the hanging ring, and the hanging ring is connected with the traction rope. Each fixed catapulting device comprises two adjacent cylinders, one end of each cylinder is closed, the otherend of each cylinder is open, the cylinders are arranged in the radial direction of the upper disc, the open ends of the cylinders face outwards, vertical grooves are formed in the middles of the cylinders, lifting rods are clamped in the vertical grooves of the two cylinders, a spring in a compressed state is arranged in the cylinder at one side of each lifting rod, and the outer ends of the springs are connected with ch