The invention relates to a weight-reduction fast food combining staple food powder, artificial meat and vegetable, which is characterized in that the staple food powder comprises konjak powder, lotus root powder, algae colloid, homogeneous mushroom powder, agar and flour; the artificial meat comprises egg, konjak powder, refined flour, soybean flour, glutamate, glutelin, casein sodium salt, sodium inosinate, calcium carbonate, crab chitin, shrimp chitin, sodium hydroxide, algae colloid and agar; the vegetable comprises: formula A) dictyophora duplicata, tremella, forest frog oviduct and welsh onion; formula B) dictyophora duplicata, auricularia auricular, zizania latifolia, green soybean, ginkgo and welsh onion; formula C) zizania latifolia, asparagus, green pepper, spring shoot, welsh onion and green soybean; and the sum of weight proportions of all the components is 100%. The invention has the advantages that according to the nutrition analysis, the nutritive value is incomparable with all the prior instant noodles sold in market; and not only the food is favorable to weight reduction, but also complete balanced nutrition is obtained by people who are on diet.