The invention relates to a using method of an intrinsic fiber Fabry-Perot vibration sensor for liquid media, which relate to the field of fiber vibration sensors and are designed for solving the problem that an extrinsic fiber Fabry-Perot vibration sensor requiring directionality of detection signals is limited in an application environment for multi-directional simultaneous detection. The intrinsic fiber Fabry-Perot vibration sensor for liquid media comprises an intrinsic fiber Fabry-Perot cavity and a cylindrical vibrator made of rigid polyvinyl chloride. The overall intrinsic fiber Fabry-Perot cavity is attached lengthwise to the outer peripheral surface of the cylindrical vibrator. The using method includes: firstly, searching a quiescent operation point; secondly, keeping the sensor to operate at the quiescent operation point, using the cylindrical vibrator to couple properties of vibration signals from all directions, and obtaining output signal synchronously changing with external dynamic vibration signal. The intrinsic fiber Fabry-Perot vibration sensor for liquid media is used for multi-directional vibration signals in liquid medium.