A low-cost, low-noise, high-precision piezoelectric ceramic fiber phase modulation system is designed, including ± 100 V linear regulator, ± 12 V linear power supply and the transistor drive circuit of piezoelectric ceramic. ± 100 V power supply’s ripple voltage is less than 10 mV, the circuit noise figure is less than 2 dB, 3 dB bandwidth is greater than 500 Hz, peak output is more than 160 V and the output current is greater than 100 mA. Through 3 dB coupler forming fiber optic Michelson interferometer and optical fiber end reflection interference signal to online calibration, the nonlinear of phase modulation is less than 5%.