Flat and folding type stirring paddle and stirring paddle system and method for fermenting high-viscosity materials

The invention relates to a flat and folding type stirring paddle, and a stirring paddle system and method for fermenting a high-viscosity material. The flat and folding type stirring paddle comprises a hub, a disc and paddles, wherein the blades comprise flat blades and folding blades which are fixed on the disc along the radial direction of the disc and are uniformly distributed at intervals, the whole folding blade is V-shaped and comprises two blades which are rectangular thin plates, the opening direction of the folding blade is consistent with the rotating direction of the paddle, the folding blade is fixedly connected with the disc at the joint of the two blades, the flat blade is a rectangular thin plate and is fixedly connected with the disc at the center line in the length direction, the flat blade extends out of the outer side of the disc to form a first extension part, the folding blade extends out of the outer side of the disc to form a second extension part, and the length of the second extension