The invention discloses a nonmetal anion and cation co-doped perovskite type mixed conductor film and a preparation method and application thereof. The chemical formula of a material of a mixed conductor film is AB(1-b)B' (b)O(2.95-theta)X0.05, wherein A is strontium; B is cobalt; B' is a non-metal cation P or B; X is a halide anion; theta is a non-stoichiometric number, and is not less than 0.2 and not more than 0.7; and b is equal to 0.05. Through the mixed conductor film disclosed by the invention, the doping of the non-metal cations at the B site reduces the use of alkaline earth metals which are easy to reduce, and the stability of the membrane material structure and the chemical stability in a reducing atmosphere are improved while the cost of metal raw materials is reduced; and a rapid ion transport channel is constructed by introducing halogen elements; the pure oxygen can be separated from the air at high temperature, so that the air passes through the non-metal anion and cation co-doped mixed conductor film, and the oxygen permeability can reach nearly 3.0 ml.min(-1).cm(-2).