NOVELTY - Producing marsh gas by taking human and animal waste matter and plant straw as raw material, comprises building a square or oblong fermentation room on ground, packaging pre-treated, pre-prepared and fermenting raw material in plastic boxes suitable for manual or mechanical transport, placing the plastic boxes filled with fermenting raw material in the sealable fermentation rooms, stacking them orderly and filling the fermentation rooms to the maximum extent.    USE - The method is useful for large-scale industrial marsh gas production.    ADVANTAGE - The method: has simple fermentation room; has easy material feeding and easy material discharge; has convenient operation, maintenance and management; improves fermentation speed; accelerates gas production speed; shortens fermentation period; and increases the yield of marsh gas. The fermentation room has a long service life, low construction cost, thus it is beneficial for the development and use of marsh gas and for the development of energy-saving ecological agriculture.    DETAILED DESCRIPTION - Producing marsh gas by taking human and animal waste matter and plant straw as raw material, where it is a large-scale industrial marsh gas production but not a method conducted in rural marsh gas tank, comprises: building a square or oblong fermentation room on ground, packaging pre-treated, pre-prepared and fermenting raw material in plastic boxes suitable for manual or mechanical transport, placing the plastic boxes filled with fermenting raw material in the sealable fermentation rooms, stacking them orderly and filling the fermentation rooms to the maximum extent, and fermenting the raw material under the effect of microorganism and producing gas. The multiple fermentation rooms are arranged in parallel into one group. One or several groups of fermentation rooms form a marsh gas workshop. The workshop, continuously and industrially produces marsh gas in large amount after arranged with transporter, cleaner and storage.