NOVELTY - Thin film (a) obtained using alumina, lithium oxide, germanium oxide and phosphorus pentoxide, is clamped between film (b) obtained using lithium salt electrolyte, boron nitride and polyethylene, and film (c) obtained using lithium salt electrolyte, lithium oxide and polyethylene glycol oxide, to obtain solid electrolyte. Thin film (a) is covered by metal lithium negative electrode and aluminum foil layer. Metal lithium cathode is connected with solid electrolyte, and battery shell, sealing ring, and waterproof ventilating film are assembled to obtain lithium air battery.    USE - Manufacture of lithium air battery.    ADVANTAGE - The method efficiently provides lithium air battery having excellent charging/discharging characteristics.    DETAILED DESCRIPTION - Alumina, lithium oxide, germanium oxide and phosphorus pentoxide are mixed in the molar ratio of 1:2.5-3.5:5.5-6.5:5.5-6.5, melted, ground, and sintered to obtain powder (a). Acetylene black (25-50 wt.%), powder (a) (50-75 wt.%) and polymer medium mixed with water, are stirred uniformly, and two nickel base material surfaces are clamped between two stainless steel plates. The resultant material is pressed, dried, and sintered under protective atmosphere to obtain positive air electrode. Alumina, lithium oxide, germanium oxide and phosphorus pentoxide are melted, ground, and sintered to obtain thin film (a). Lithium salt electrolyte (18-25 wt.%), boron nitride (8-16 wt.%), and remainder of polyethylene, are mixed, ball-milled, and hot-pressed to 200-400 mu m to obtain thin film (b). Lithium salt electrolyte (18-25 wt.%), lithium oxide (8-16 wt.%) and remainder of polyethylene glycol oxide, are mixed, ball-milled, and hot-pressed to size of 200-400 mu m, to obtain thin film (c). The thin film (a) is clamped between film (b) and film (c) to obtain solid electrolyte. The thin film (a) is covered by metal lithium negative electrode and layer of aluminum foil. The metal lithium cathode is connected with the thin film solid electrolyte, and battery shell, sealing ring, and waterproof ventilating film are assembled to obtain lithium air battery.