The utility model discloses a spiral water conservancy diversion stirring formula methane -generating pit that plant used, including methane -generating pit body, the stirring body and drive assembly, the stirring body is including lifter and spiral plate, the lifter is vertical to be set up in the center of methane -generating pit body, the spiral plate is fixed in the lifter lower extreme, methane -generating pit body inner wall is fixed with a plurality of guide plates, the guide plate is align to grid around the spiral plate, the utility model discloses a spiral water conservancy diversion stirring formula methane -generating pit that plant used fluctuates through the spiral plate and can realize carrying out even, abundant stirring to the feed liquid, and the feed liquid that adopts the spiral plate structure to enable on it is simultaneously followed the face helicoidal flow of spiral plate and make feed liquid vortex flow under the water conservancy diversion effect of guide plate, improves stirring effect, does benefit to brokenly the shell and guarantees the methane -generating pit gas production.