To solve the conflicting problem of high natural frequency and low sensitivity of geophones in the exploration and detection of medium-high frequency seismic signals, a fiber grating medium-high frequency seismic geophone based on a lever amplification mechanism is proposed. One end of the inertial mass block is connected to the lever amplification mechanism, and the fiber grating is vertically fixed on the amplification end of the lever and the base using a two-point packaging method. The lever amplification mechanism can produce mechanical amplification at the output end of the detector, increase the axial strain of the fiber grating, and increase the response to weak medium-high frequency signals in the formation, thereby improving the sensitivity of the detector. At the same time, the mechanical structure of the detector uses integrated processing technology, which can improve the rigidity and stability of the mechanical structure. Experimental tests show that the natural frequency of the detector is 526 Hz, the sensitivity is 119.1 084 pm/g in the frequency range of 20—260 Hz, and it has good lateral anti-interference performance. It provides certain technical ideas and directions to study the medium-high frequency seismic geophone.