The invention relates to a lick brick for a ruminant animal, and specifically discloses a composite premixed feed lick brick for a grazing yak. The composite premixed feed lick brick for grazing yak comprises salt, cement, bentonite, urea, ammonium chloride, calcium formate, a flavoring agent, calcium hydrophosphate, ferrous sulfate, copper sulfate, zinc sulfate, magnesium sulfate, manganese sulfate, sodium selenite, cobalt chloride, calcium iodate, rumensin and composite multi-vitamins; and the density of the lick brick is 1.8-2.1 g / cm<3>. The composite premixed feed lick brick is researched and developed according to the physiological property of the grazing yak, provides sufficient microelements and vitamins for the grazing yak, and additionally complements part of the non-protein nitrogen, so that the defect of lack of a protein source for the grazing yak fed with forage grass is avoided, the feed intake and the digestive efficiency of the grazing yak are effectively improved, the growing and fattening speed of the yak is increased, the quality of beef is improved, the immunity of the yak is strengthened, the deficiency disease and the metabolic disease of the yak are effectively prevented, and the culture benefit is improved.