NOVELTY - Direct solar heat storage anaerobic digestion device includes multiple direct heat storing solar panels, each comprising base plate, rectangular side frame, cover panel, and multiple phase-changing containers, which are flatly provided on the upper end face of the base plate. The multiple phase-changing containers are located in the rectangular side frame. The cover panel is fixedly mounted on the upper end face of the rectangular side frame. Phase-changing heat storing working media are filled in the phase-changing containers.    USE - Direct solar heat storage anaerobic digestion device useful for processing sewage and cow dung.    ADVANTAGE - The device solves the problem of wasted energy for heating via the heater in the prior art anaerobic digestion device. It fully uses the solar energy source. The solid and liquid phases of phase-changing heat storing working media in the phase-changing containers of the direct heat storing solar panel can be changed at a certain temperature, so that amount of latent heat can be absorbed and stored by the direct heat storing solar panel.    DETAILED DESCRIPTION - Direct solar heat storage anaerobic digestion device comprises tank body, benzene plate layer, feeding tube, discharging tube, first temperature sensor, liquid level sensor, methane pressure releasing device, 4 stopping valves, and multiple direct heat storing solar panels. An open hole is provided on the tank body. The benzene plate layers are provided on the bottom end face of the tank body and the side wall having the open hole. The feeding tube is communicated with the cavity of the tank body. The discharging tube is communicated with the cavity of the tank body. One end of the first temperature sensor passes through the side wall of the tank body and is provided in the cavity of the tank body. The output end of the liquid level sensor passes through the upper part of the side wall of the tank body and is provided in the cavity of the tank body. The output end of the methane pressure releasing device passes through the upper part of the side wall of the tank body and is provided in the cavity of the tank body. Stopping valves are provided on the feeding tube, discharging tube, first temperature sensor, and liquid level sensor. The direct heat storing solar panels are mounted on the outside wall and the upper end face of the anaerobic digestion device. The direct heat storing solar panel comprises base plate, rectangular side frame, cover panel, and multiple phase-changing containers, which are flatly provided on the upper end face of the base plate. The rectangular side frame is fixedly mounted on the base plate. The multiple phase-changing containers are located in the rectangular side frame. The cover panel is fixedly mounted on the upper end face of the rectangular side frame. Phase-changing heat storing working media are filled in the phase-changing containers.