A method for fabricating optical fiber Fabry-Perot (FP) pressure sensor by using CO2 laser to melt capillary end face is proposed. The F-P structure is composed of ordinary single-mode fiber (SMF) and a silicon film prepared based on the end face of a CO2 laser fusion capillary. In this paper, the manufacturing process and melting parameters of the silicon thin film are introduced in detail and performance tests are performed on the F-P pressure sensor. The results show that the fabricated fiber F-P sensor realizes good sensitivity and linearity to the pressure, obtaining a sensitivity of 16.37pm/kPa, and the linearity of 0.998.