Feed additive processing and fermenting device

The utility model belongs to the technical field of feed processing, and particularly relates to a feed additive processing and fermenting device which comprises a fermenting device main body and a bracket arranged on the surface of the fermenting device main body, and further comprises an expansion assembly arranged above the fermenting device main body, the expansion assembly comprises a rubber ring arranged above the fermentation device main body, a plurality of fixing plates mounted on the outer side of the rubber ring and a positioning rod which is rotationally connected to the surface of one side of each fixing plate and is of a dry structure, and through the rubber ring, the fixing plates and the positioning ring which are arranged, when the fermentation device is used, the fermentation device main body can automatically expand the fermentation device according to the feeding amount; the range of the feeding port is adjusted, the feed additive cannot leak, the feed additive can conveniently enter the f