The soundproof box uses a dedicated enclosure with a built-in generator set. It features independent patented noise reduction technology. The structure is compact, aesthetically pleasing, and square. It has a reflux air duct for better airflow. The box uses high-performance, flame-retardant, and aging-resistant sound insulation materials. A built-in impedance composite muffler effectively suppresses noise. The noise level can be reduced to below 70dBA.