The invention provides a launcher sublevel recovery method. The launcher sublevel recovery method comprises the steps that 1, an installation platform is designed and installed between an upper half section and a lower half section of an inter-level section of a sublevel, two stabilizing parachutes, two deceleration parachutes and three main parachutes are installed on the installation platform, and the lower portion of an inter-level section cabin of a launcher and the lower portion of a rear transition section cabin of the sublevel of the launcher are each provided with a buffering air bag; 2, when the sub-level falls to the parachute-opening height, the two stabilization parachutes are horizontally popped, the sublevel is vertically stabilized under the action of the stabilization parachutes, the stabilization parachutes are separated from the sublevel, the two deceleration parachutes are pulled out by the stabilization parachutes, the deceleration parachutes are inflated to decelerate the sublevel, the upper half section and the lower half section of the inter-level section of the sublevel are separated, the three main parachutes are pulled out during separation, after the main parachutes are pulled straight, the deceleration parachutes carry the upper half section of the inter-level section to enable the upper half section of the inter-level section to be separated from the main parachutes, the sublevel is decelerated steadily under the action of the main parachutes, a hung sling is pulled out from one side wall of the sublevel after the sublevel is decelerated steadily, and vertical hanging of the sublevel is converted into horizontal hanging of the sublevel; 3, the buffering air bags are opened before the sublevel lands, and then recovering is completed.