The invention relates to a preparation process for a fattening cream river crab compound feed and belongs to the technical field of agricultural breeding. The compound feed is prepared from the following materials: high protein flour, peeled expanded bean pulp, fermented bean pulp, fish meal, chicken powder, shrimp powder, sleeve-fish paste, phospholipid oil, soya-bean oil, fish oil, spirulina, choline chloride, zeolite powder, monocalcium phosphate, table salt, yeast hydrolysate, antibacterial peptides, chitosan compound vitamins, compound organic microelements and astaxanthin. By roughly crushing the materials first and then carrying out ultraomicro crushing on the materials, the materials are fine enough. The materials are mixed in grade and can be fully mixed, so that the fusing degreeof the powder and the oil is improved, and follow-up tempering and expanding operations are facilitated. The longer the tempering time is, the longer the contact and mix time of vapor and the powderyfeed is, and the more the added vapor amount is, the more favorable the curing of the river crab feed is. The tempered materials are extruded and expanded, so that starch is fully cured, the proteinsare deteriorated, the antinutritional factors in different feed raw materials are deactivated, and insects are killed and bacteria are sterilized, and therefore, the digestive absorption utilizationof the feed by the river crabs is improved, the intestinal tract irritation is reduced, diseases are reduced, and the water quality is improved.