The refined feed crushing unit is a new type of feed processing equipment used in the aquaculture industry, which integrates crushing and mixing. It can also be called a feed crushing and mixing combination machine, a feed crushing and mixing unit, and a self-priming feed crushing and mixing machine. The feeding uses the wind power of the self crushing machine to suck corn kernels, soybeans, wheat and other grains into the feed crushing chamber, and then carry out crushing and mixing work.