The invention provides a sound sensor, and the sound sensor comprises a substrate; a longitudinal wave transmitting element formed on the surface of the substrate; a longitudinal wave detection element which is formed on the surface of the substrate, is separated with the longitudinal wave transmitting element by a preset distance, and is used for detecting a longitudinal wave signal emitted by the longitudinal wave transmitting element; a sound sensing film which is formed on the longitudinal wave transmitting element and the longitudinal wave detection element, and is used for sensing an external sound signal. The longitudinal wave transmitting element transmits a longitudinal wave according to the external sound signal, so as to amplify the external sound signal, and generate an amplified sound signal. The sound sensor can amplify the external sound signal through the longitudinal wave transmitting element and the longitudinal wave detection element, and can enable the adhesion performances and the falling resistance to be greatly improved.