The invention discloses a tea seed cake feed for improving meat quality of fattening pig. The tea seed cake feed is prepared from the following raw materials of detoxified tea seed cake, tea dust, cottonseed cake, grape wine distiller, peanut bran, grape seed extract, egg yolk, traditional Chinese medicine preparation for medium and large pigs, cortex eucommiae, semen cucurbitae, folium mori, mulberry fruit, vitamin E, glutamic acid, leucine, arginine, lysine, saccharomyces cerevisiae, lactobacillus, aspergillus niger, aspergillus oryzae and bacillus subtilis. The invention also discloses a preparation method. The tea seed cake feed has the advantages that the detoxified tea seed cake contains tea saponin, so that the permeability of pig intestinal mucosa is imrpoved, the absorbing of nutrients is accelerated, the growth property of the pig is improved, and the utilization rate of the feed is improved; because saccharicterpenin is contained, the pH (potential of hydrogen) value of theintestine is reduced, the propagation of harmful bacteria is inhibited, and the functions of enhancing the immunity of the pig body, clearing the free radicals and improving the meat quality are realized; the compounding is scientific and reasonable, the content of fat in the pig muscle and the composition ratio of fatty acids can be influenced, the immunity of the pig body is enhanced, and the meat quality of the pig is improved.