Mixed feed for worm and grass chicken breeding, and preparation method thereof

The invention relates to a mixed feed for worm and grass chicken breeding, and a preparation method thereof. The mixed feed is composed of a conventional feed and a core feed, and the conventional feed is prepared from, by weight, 80-120 parts of corn, 15-30 parts of wheat bran, 6-12 parts of stone powder, 1-2 parts of salt and 4-10 parts of calcium hydrogen phosphate; and the core feed is prepared from, by weight, 40-55 parts of roxburgh rose fruit residues, 8-15 parts of a roxburgh rose fruit juice, 10-20 parts of pumpkin powder, 5-10 parts of earthworm powder and 1-2 parts of garlic. The mixed feed prepared by the method has the advantages of simple and cheap raw materials, no hormones or antibiotics, no side effects, improvement of the immunity of chicken bodies, dispelling of parasites in the chicken bodies, meeting of the development demands of the modern aquaculture industry, improvement of the quality of animal products, achieving of natural, green and healthy purposes, broad market prospect, and suit