At present, in terms of the heating effect of the micro loudspeaker analysis, there were some studies, this paper made a simple introduction of the structure and working principle of the speaker, using the finite element method to solve the temperature field of the speaker in the working process numerically. The micro loudspeaker model is set up in COMSOL Multiphysics finite element analysis software, and the grid dirision is carried on, the internal temperature distribution when the speaker is working is simulated and analyzed. The temperature field distribution of 2 d and 3 d graphics and the distribution of internal flow velocity field and temperature contrast figure of the internal different parts is get. Conclusion provide certain theoretical reference for the design and research of the mini speaker.