A medium and high frequency fiber Bragg grating (FBG) acceleration detector based on lever amplification is proposed.The acceleration sensitivity and amplitude-frequency characteristics of the detector are theoretically analyzed and experimentally studied.The experimental results show that the change of central wavelength of the detector has a good linear relationship with the change of external acceleration.The natural frequency of the detector is 612 Hz and the flat area range is 20—250 Hz.The linearity is 0.995,the acceleration sensitivity is 106.7 pm/g,and the cross sensitivity is less than 4.9%.It has good anti-interference ability.