The utility model discloses a machinery mould pressing glass steel roof pressure formula methane -generating pit, including the cell body, the top cap, the bottom of the pool, the water pressure pipe, advance the discharge gate, the mantle pipe, the air duct, the cell body, the top cap, the combination of bottom of the pool flange bolt is the rectangle methane -generating pit, two water pressure casees of top cap top installation, respectively there is one to advance the discharge gate in the middle of every water pressure case, every advances discharge gate sealing connection mantle pipe, every mantle pipe end opening leaves the long two halves circle of 300mm, two halves circles lower extreme respectively uses two root zone ferropexies as the plain film, it is flagging not crooked to make the hose, mantle pipe end opening is automatic and unification piece in the feed liquid, miss in preventing marsh gas follow mantle pipe, the marsh gas cell body, the top cap, the bottom of the pool, the film is made by high -quality glass silk and polyester resin to the water pressure case, put in casting steel mold, through high temperature, the compoboard of high pressure preparation, by the flange, bolted connection, sealed methane -generating pit of gluing sealed combination, intensity is big, and service lifetime is long, convenient carrying, the feed liquid stirring is convenient in the pond, the business turn over material is easy, the convenience that keeps warm heats, product gas is many, atmospheric pressure is big, good effects.