The invention relates to a diphase mixed conductor oxygen permeation membrane material and a preparation method thereof, belonging to the technical field of comprehensive utilization of metallurgy resource and ceramic manufacture. The oxygen permeation membrane material structurally comprises two phases fluorite and similar perovskite, and is prepared through steps of respectively preparing fluorite Ce0.8Gd0.2O2-detal powder and similar perovskite PrBaCoxFe[2-x]O[5+y] powder through a sol-gel method, mixing the two phases of powder according to certain weight percentage, grinding, and molding under certain pressure, thereby obtaining a green body, roasting for 5-8 hours at 1130-1180 DEG C, so as to obtain the diphase mixed conductor oxygen permeation membrane. The two phases of the membrane prepared by the method are distributed uniformly, and the membrane has a compact structure, has no mixed phase and has good chemical compatibility. Under the condition that the temperature is 925 DEG C, the air mass flow is 300mlmin<-1>, and helium mass flow is 100mlmin<-1>, high oxygen permeation flux of 2.81.1*10<-7>mols<-1>cm<-2> is obtained, and therefore, the oxygen permeation membrane material has application potential.