The invention discloses a wearable sound detector based on a piezoelectric film and belongs to the field of extendible bioelectronics. The piezoelectric film in the wearable sound detector adopts a checkerboard embedded snakelike mesh structure or a snakelike fractal structure and has a certain extensibility in use, and a sound signal of a person can be still stably detected under large-amplitude tension and bending. The wearable sound detector is low in device manufacturing cost and is easy to realize large-scale industrial production.