To satisfy the demands of self-powered monitoring system for gas pipe，a magnetic coupling gas piezoelectric turbine energy harvester based on turbine structure is presented. The theoretical model of the energy harvester is established，simulated and analyzed. The prototype is designed and fabricated for test，obtaining the influence of magnets arrangements，proof masses，connections and resistance on the output capability. The results show that multiple appropriate pressures lead to the peak voltage，and the peak value of the main frequency and the position of the frequency division are related to the magnets arrangements. The best pressure and peak output voltage value can be adjusted by proof masses，and the best range of input air pressure can be widened by series or parallel connected PZT oscillators with different proof masses. Besides，there are different optimal loads（40 kΩ，15 kΩ）to maximize the output power（41 mW，50 mW）for series or parallel connected piezoelectric oscillator.