Provided is a low-frequency vibration detection device employing laser interference, comprising an optical system and a detection system. The optical system and the detection system are fixedly installed to a base plate. The optical system comprises a test light path and a reference light path. The test light path and the reference light path generate an interference beam. The detection system receives the interference beam, and processes and displays an image of the interference beam. The principle of laser interferometry is applied in the detection of low-frequency vibrations of an apparatus, and a shift of interference fringes is detected to determine whether precise interference processing and testing can be normally performed so as to obtain a reliable result. The system detects extremely slight ambient vibrations and has a high detection accuracy. A simple optical system and a detection system are used to acquire and process interference fringes, greatly simplifying the structure of the detection device and reducing costs. A display is used to display the fringes to improve user experience, and an alert apparatus is used to alert the user when a threshold is exceeded, thereby increasing system intelligence.
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