The invention provides a photoelectric oscillation radio frequency doubler based on double parallel modulators, and belongs to the technical field of microwave photonic microwave radio frequency doubling signal generation. The photoelectric oscillation radio frequency doubler comprises a continuous laser source, double parallel modulators containing upper and lower arms, an optical coupler, N paths of long optical fibers with different lengths, N photoelectric detectors, an electric coupler, an electric amplifier and an electric signal power divider; front ends of the upper and lower arms are connected with an output end of the continuous laser source, back ends of the upper and lower arms are merged to form an interference structure, the output end of the interference structure are connected with the optical coupler and is connected with the N photoelectric detectors through the N paths of long optical fibers, the photoelectric detectors are connected with the electric signal power divider through the electric coupler and the electric amplifier, the first output end of the electric signal power divider outputs a frequency doubling radio frequency electric signal, and the second output end is connected with the lower arms of the double parallel modulators. Compared with the traditional frequency doubling technology, the photoelectric oscillation radio frequency doubler can obtain frequency doubling radio frequency signals with greater bandwidth, higher frequency and better phase noise performance.