Marsh gas tank

The utility model relates to a methane pot comprising a polyvinyl chloride pot body, the main body of which is barrel-shaped and the upper portion of which takes the shape of an inverted pyramid. An air outlet is positioned on the pyramid tip, and the side-wall of the main body is equipped with a feed hole. The utility model has the advantages of simple structure, easy modeling, being made from the high molecular polymer of polyvinyl chloride, light weight, convenience of transportation, good air tightness, convenience for generating pressure because of the inverted pyramid-shaped upper portion, profits of use, low cost of the whole production, and easy construction.