Abstract: In order to meet the requirements of noise reduction and heat dissipation for power equipment, a ventilated sound insulation shield with a periodic distributed structure is proposed. Many ventilation and noise elimination units are embedded in the plate of the sound insulation shield. While sound wave attenuates, the airflow can be dissipated smoothly through the shield plate. The design of the distributed ventilation sound insulation shield is introduced, and its sound insulation performance is analyzed by theory. The inserted sound losses of the distributed ventilation and sound insulation shield for three different devices are calculated and measured, and the results show that the calculated values are in good agreement with the measured values. The distributed ventilation and sound insulation shield has a good sound insulation effect at the frequencies above its passing frequency, and the effective noise reduction frequency can be specially designed according to the frequency characteristics of different sound sources. It is suitable for sound insulation of various devices requiring ventilation and heat dissipation.