Low vehicle noise is not only the advantage of the new car, but also because of the low vehicle noise, it is not easy to attract the attention of other road users when driving at low speed, thus bringing new security risks. Therefore, it is extremely necessary to add a device on the vehicle to actively make certain sounds, so as to actively prompt pedestrians and other road users and effectively avoid the occurrence of safety accidents. And this device is the low-speed driving prompt sound device. The so-called "low-speed driving sound device" means that when the vehicle is in a low-speed state, that is, 0 to 20 kilometers per hour, it can emit a sound containing a certain sound pressure level, frequency information to prompt other road users of parts or components.