A fiber-optic Fabry-Perot (F-P) high-temperature sensor based on sapphire wafer was proposed and fabricated. The sensor uses the sapphire fiber with angled end face as a transmission waveguide, the sapphire wafer as a Fabry-Perot (F-P) interferometer and the structure of “Zirconia ferrule-Zirconia tube”as the fixing structure of the sensor. The reflection spectrum of the interferometer was demodulated by performing a combined algorithm of fast Fourier transform algorithm and minimum mean square error estimation.Temperature ranged from 20℃ to 1000℃ is measured, and the obtained precision is ±2.5℃. The sensor has the advantages of small size, low cost, simple fabrication and high repeatability. It can be applied for stable and accurate temperature measurement in high temperature environments.