The invention relates to full-mixed pellet feed for mutton sheep and a production method thereof. The feed is composed of the following raw materials by weight percentage: 30% to 50% of maize straw, 5% to 15% of alfalfa, 5% to 10% of beet pulp, 5% to 10% of dry brewer's grains, 15% to 25% of corn, 5% to 10% of bran, 5% to 10% of bean pulp, 5% to 10% of cotton seed meal, 1% to 5% of molasses and 1% to 2% of premixed feed. The production method comprises kneading, smashing and mixing the raw materials with the mixing uniformity within 5%, and after mixing evenly, using a special feed pellet pressing machine to pelletize with steam pressure of 0.3 MPa to 0.4 MPa, temperature of 70 DEG C to 75 DEG C and ring die diameter of 6mm to 12mm. The feed has the advantages of being rich in nutrition for all growth stages of mutton sheep, good in palatability, appropriate in concentrate-roughage ratio, favorable for relative stability of potential of hydrogen (pH) in rumen of mutton sheep and capable of effectively preventing digestion from disordering to greatly improve feed conversion rate. Daily gain of mutton sheep having the feed can be improved by more than 10%, and feed cost is reduced by more than 5%.