Multi-monomer interconnected automatic pressure-regulating methane tank

The utility model relates to a multi-monomer interconnected automatic pressure-regulating methane tank. A pretreatment tank (9) is communicated with a fermentation tank (5) through a feed pipe (4), the external wall of the fermentation tank (5) is connected with an air outlet pipe (11), the bottom at one side of the fermentation tank (5) is provided with a slag outlet (12), a cover plate (10) is fixed on the fermentation tank (5), and a support (3) is fixed at the upper part and the external side of the fermentation tank (5). A solar hot water tank (2) is fixed on the support (3) and is communicated with the pretreatment tank (9) through a hot water pipe (1), and adjacent fermentation tanks (5) are communicated with each other through blow-by holes. The output of methane can be increased by adding the fermentation tanks (5), and the adjacent fermentation tanks (5) are communicated with each other through blow-by holes for pressure regulation. The utility model has practical and safe structure, easy operation