The invention discloses a growing-finishing pig low-protein daily feed capable of improving meat quality, which consists of corn, soybean meal, wheat middling, germ meal, a variety of amino acids, betaine hydrochloride, montmorillonite and basal premix. The invention also discloses a feeding method of the growing-finishing pig low-protein daily feed. Since the invention adds the amino acids and the betaine hydrochloride into the growing-finishing pig low-protein daily feed, while the growth performance of growing-finishing pigs is kept or enhanced, the nitrogen intake of pigs is decreased, the absorption and utilization rates of nitrogen in the pig body are increased, consequently, the content of nitrogen in pig feces is decreased in the end, the environment of a pig farm is improved, moreover, the carcass quality is improved, the eye muscle area is enlarged, and the thickness of back fat is decreased.