The invention discloses a loudspeaker. The loudspeaker comprises a vibration system and a magnetic circuit system which matches the vibration system mutually. The vibration system comprises loudspeaker diaphragm. The loudspeaker diaphragm comprises TPU film. The vibration amplitude when the loudspeaker diaphragm vibrates is 0.25mm-1mm. F0 of the loudspeaker is 150-1500Hz. The loudspeaker is characterized by good audition effect.