Abstract: China′s aquaculture industry is increasingly developed and the demand for feed is increasing.But automatic feed fermentation machinery is less.The level of feed fermentation and unloading machinery is low.Improved design was made for feed fermentation machine.This machine included turning over and mixing mechanism，lifting and falling mechanism，lifting and falling limit mechanism.And it realized automatic control using single chip microcomputer for convenient operation.This feed fermentation machine could eliminate time difference of feed fermentation，improve feed quality and nutritional value.It had a certain significance for the development of China′s feed fermentation machinery.