The invention discloses a tunable photoelectric oscillator based on PT symmetric combination with a high-Q resonator, and belongs to the field of microwave photonics. The tunable photoelectric oscillator comprises a continuous light laser light source, a polarization controller, a phase modulator, a high-Q resonator, a Mach-Zehnder interferometer, a photoelectric detector, an electric amplifier and an electric power divider. a light carrier output by the laser enters the phase modulator, a microwave signal is modulated to the light carrier through the phase modulator and input to the high-Q resonator, a tunable microwave photonic filter is obtained, delay and preliminary mode selection are performed on the microwave signal, mode selection is further enhanced in combination with PT symmetric breaking on the basis, finally, a microwave signal carried on an optical signal is detected through a photoelectric detector, positive feedback is introduced through the photoelectric oscillator loop, and the microwave signal is finally output. According to the invention, the high-Q resonator is used for time delay and preliminary mode selection, and PT symmetric breaking enhancement mode selection is further combined, so that the output frequency tunable photoelectric oscillator is realized.