A loudspeaker fault detection device is used for detecting a loudspeaker fault, and comprises: a detection module, wherein the working voltage end of the detection module is connected with an externalpower supply, and the detection module is used for detecting the vibration state of a loudspeaker and outputting a corresponding vibration level; a microprocessor module which is connected with the output end of the detection module and is used for detecting the vibration level transmitted by the detection module and outputting a corresponding control signal; an alarm module which is connected with the microprocessor module and used for giving an alarm after receiving the control signal; and a power module which is used for supplying power to the device. The vibration state of the installation carrier is collected through the detection module, recognition of loudspeaker faults is achieved, the loudspeaker faults are not prone to being affected by the surrounding environment, and meanwhilethe specific loudspeaker fault can be recognized by arranging the detection module in different loudspeaker areas on the installation carrier. In addition, an alarm module is added, so that faults can be visually known in real time.