The invention discloses a process for extracting krill krill oil, co-produced protein and chellotosan from antarctic krill powder. The process comprises the following steps: 1, krill oil is extracted, wherein the phospholipid content of the krill oil is 38-45%, and the astaxanthin content of the krill oil is 240-350 mg/kg; 2, protein is extracted, and the yield of the protein extracted through the alkali-solution and acid-isolation method is 30-36%; 3, chellotosan is prepared, alkali deproteinization and acid decalcification are performed on shrimp shells, and the deproteinization and decalcification operations are repeatedly performed for two times to prepare high purify chellotosan, and the yield of the chellotosan is 13-21%. According to the invention, three types of high purify products, namely the krill oil, the protein and the chellotosan, are extracted in sequence, so that the comprehensive utilization ratio of a raw material and the added value of products are greatly improved; the antarctic krill is replaced by the antarctic krill powder, so that the rich raw material source is realized, the severe conditions are avoided during storage and transformation of the antarctic krill, and the process is suitable for large scale industrial production; during the production process, the cyclic utilization of organic solvents, waste liquor and waste residue, and high value and efficient comprehensive utilization of sources are realized.