The invention discloses an energy increase type foam drainage gas recovery process. Firstly, a reagent A is fed into accumulated liquid in a gas well, then a reagent B is fed into the accumulated liquid in the gas well, wherein the reagent A comprises sodium nitrite A1 and ammonium chloride A2, and the reagent B comprises a catalyst and a foaming agent. According to the invention, by injecting the chemical agents in the well in batches and through different channels, chemical agents are in chemical reaction in the well to generate lots of gases and foam, under the action of gases generated by chemical reaction, foam moves upwards to drain accumulated liquid in a wellbore, and thus a conventional foam drainage gas recovery process is expanded to peripheral wells and flooded out wells with extremely low yields, and the recovery percent of the gas well is increased further.