The invention belongs to the technical field of low-pressure low-permeation gas field reservoir repeated reconstruction, and provides an air cushion type filtration reducing and drainage assisting method for low-pressure gas field old well repeated reconstruction. The method comprises the steps of 1) communicating a liquid gas tank, a booster pump with a fracturing vehicle A to the well mouth to form a first fracturing construction route and communicating a mixing truck, a tank truck, a fracturing blender truck with a fracturing vehicle B to the well mouth to form a second fracturing construction route; 2) pumping a liquid gas; 3) carrying out construction of a fracturing sand-carrying stage; and 4) carrying out fracturing fluid flowback. According to the method, the liquid density can be reduced through the liquid gas added during construction, so that the flowback velocity of the fracturing fluid can be improved after fracturing, the flowback rate of the fracturing fluid is improved, the damage of the fracturing fluid to the stratum is reduced, the reconstruction effect is greatly improved, and the construction period is shortened; and the method has the characteristics of simple process, convenient operation and high practicability, and the application prospect is quiet wide.