Solar biogas device

The utility model belongs to the field of biogas production devices and in particular relates to a solar biogas device. The solar biogas device comprises a plurality of biogas tanks and a solar water heater, wherein a tank opening is formed in the top of each biogas tank; circulating water pipes are arranged in the biogas tanks; inlets of the circulating water pipes are connected with a water outlet of the solar water heater by a main water inlet pipe; a water pump is arranged on the main water inlet pipe; outlets of the circulating water pipes are connected with a main water outlet pipe; the main water outlet pipe is connected with a water inlet of the solar water heater; the biogas tanks are in a spherical shell structure and have split upper and lower parts; feed pipes are arranged in the tank openings and are connected with a main feed pipe. The biogas production device has a reasonable structure, is simple in connection and can achieve the effects of improving the biogas production efficiency, reducing the cost and simplifying the production technology by using feeding, biogas production and water circulation.