The wire metal grating (WMG) is fabricated on the tip of a standard single mode fiber (SMF) at 1550 nm wavelength by focused ion beam (FIB) technology. The metal used is Au and period of the grating is 200 nm, much smaller than the wavelength of incident light. The transmission light entering the structure is polarization according to the effective medium theory (EMT)）.The reflection contrast between TE and TM modes in our experiment reaches 13.7 dB, which is sensitive enough to monitor the polarization change induced by photoelastic effect and Faraday effect. Based on this WMG grating, a pressure sensor with the sensitivity of 0.237 rad/N and a current sensor with the sensitivity of 0.06022°/A are presented.