The invention discloses a high-oxidization-resistance and high-conductivity crosslinked type polybenzimidazole high-temperature proton exchange membrane and a preparation method therefor. The crosslinked membrane takes polybenzimidazole as a polymer framework; through polymerization, a crosslinked net-shaped structure is formed in the membrane by taking vinyl phosphonic acid and vinyl triazole as a crosslinking agent; and a free radical quenching agent which can improve the oxidization resistance of the membrane is doped in the membrane to prepare the high-oxidization-resistance and high-conductivity high-temperature proton exchange membrane. The crosslinked high-temperature proton exchange membrane disclosed by the invention has relatively high proton conductivity and excellent dimensional stability in a non-humidifying condition, and has high oxidization resistance, so that the problem of phosphoric acid loss of a polybenzimidazole/phosphoric acid membrane is completely solved, and the bottleneck that the polymer membrane is degraded under attack of free radicals is overcome; and therefore, the proton exchange membrane can be applied to a high-temperature proton exchange membrane fuel cell, a direct alcohol type fuel cell, an electrochemical sensor or other electrochemical apparatuses as the proton exchange membrane.