In view of the current market common kitchen waste composting box is not easy to keep warm, the composting time is long, the effect of drainage is poor, the odor is heavy and so on. A small household composting box is designed and its spatial structure is designed and optimized. The device includes several modules, such as solar collector, solar panel, ventilator, feeding port, leachate screen, tail gas treatment and so on. It can better meet the requirements of high temperature aerobic composting process. It uses solar energy for the whole system of heat preservation, ventilation and energy supply, reducing energy consumption. Compared with natural composting, composting time is shortened. The whole system is easy to move and is not restricted by the place of placement. It is very suitable for use in the courtyard.