The pressure sensor base on high temperature co-fired ceramic is widely used to harsh environment. This paper proposed and fabricated a wireless and passive high temperature pressure sensor base on Al2O3 ceramic. Firstly, in room temperature and pressure test range from 0 to 4 bar, the mechanical model of this sensor is analyzed with Ansys simulation software, the result is the maximum equivalent stress of square Al2O3 ceramic less than maximum allowable stress. Afterwards, this paper introduces the preparation method of Al2O3 ceramic pressure sensor, the technical process main include slice and punching, lamination and thermal pressure, high-temperature sintering, screen printing and post-fire. Finally, the sensor is measured for its conductivity. This pressure sensor has a good application for pressure measurement in room temperature for and performance research in high temperature.