In the salt brick as animal feed, are added 11 kinds macro elements including C, O, H, N, Ca, P, Cl, K, Na, Mg and S; trace elements Fe, Cu, Mn, Zn, Co, M, B, I, V, Si, Se, etc.; as well as Chinese medicine with the functions of increasing immunity, resisting disease, regulating vital energy, appetizing, etc. It can promote the growth of animal, stimulate animal's appetite and raise animal's weight gain. In addition, it has no hormone and antiseptic and thus has no harm to animal, no toxic side effect and no environmental pollution.