The utility model discloses a parallelly connected big -and -middle -sized methane -generating pit of heat preservation high temperature fermentation that heats in many ponds, it is by a plurality of fermented cell bodies, the glory transparent plate, linking bridge, the pond is mixed to the feed liquid, the mixer, the charging pump, the conveying pipe, discharging valve, arrange the material pipe, the air duct is constituteed, every fermentation cell body is a metal cell body of being scribbled the black anticorrosion paint by the steel sheet welding, sealing connection glory transparent plate combination vacuum layer around the cell body, it heats to make the cell body reach, best effect keeps warm, the one time that last cell body is lighter than former fermentation cell bodies is arranged to a plurality of fermented cell bodies, outside the whole ponds of discharging in the thorough back of feed liquid fermentation of after -bay, it mixes in the pond from the feed liquid and advances new material forward in the fermentation vat through the inlet pipe to start the charge pump, row material pipe valve door is opened to the forebay, in flowing in the after fermentation pond through water head pressure feed liquid is automatic, automatic the flowing of last little fermentation vat expires, the primary fermentation pond stops the feeding, this novel beneficial effect is the high temperature fermentation, the factor of created gase is high, energy saving and environmental protection, low running cost, the feed liquid fermentation thoroughly, there is not the germ in the after -bay exhaust sediment liquid, virus is survived, and no secondary pollution, the organic?compound that can directly make high -quality environmental protection is fertile.