Abstract: A portable intrinsically-safe device for acquiring vibration signal comprises a vibration signal acquisition unit, a signal processing unit, a signal storage unit and an intrinsically-safe power source, wherein the vibration signal acquisition unit is connected to the signal storage unit through the signal processing unit; the intrinsically-safe power source supplies power for all the units; the signal processing unit and the signal storage unit are integrally packaged in an intrinsically safe manner. The device solves the vibration signal acquisition from a large portable electromechanical equipment, providing a powerful data information for equipment status monitoring and failure analysis. Particularly, intrinsically safe design satisfies the test requirements when the portable equipment is under a complex and harsh environment of a coal mine well. The device is easy to mount, low in power consumption, easy to control, flexible to use and wide in range of application.