The invention provides a composite organic phosphonic acid high-temperature proton exchange membrane for a fuel cell and a preparation method of the composite organic phosphonic acid high-temperatureproton exchange membrane, in particular, the composite organic phosphonic acid high-temperature proton exchange membrane provided by the invention is characterized by taking a polybenzimidazole-type compound A and a neutral organic phosphonic acid copolymer B as raw materials and compositing the raw materials, wherein the molar ratio of A to B is nA:nB=1:(0.01-99.99). The high-temperature proton exchange membrane has the advantages that preparation of a polymer is easy, the membrane forming technology is simple, the organic phosphonic acid content and the proton conductivity are accurate and controllable, and the like; the preparation method is suitable for preparing the high-temperature proton exchange membrane with high electrical conductivity and good mechanical strength.