The invention discloses a livestock and poultry farm environment improver and a preparation method thereof. The environment improver includes, by weight, 30-60% of montmorillonite, 10-40% of calcium hydrogen phosphate, 10-30% of stone powder, 1-15% of ferrous sulfate, 1-10% of iron oxide red, 0.1-5% of copper sulfate, 0.1-5% of zinc oxide, 0.05-3% of phosphoric acid, and 0.05-3% of essences. The preparation method includes the steps of: grinding the montmorillonite, the calcium hydrogen phosphate and the stone powder respectively in a pulverizer, and sieving the powders to obtain the powders in corresponding particle sizes, and mixing and stirring the powders according to the ratio to form a mixture A; mixing and stirring the ferrous sulfate, the iron oxide red, the copper sulfate, the zinc oxide, the phosphoric acid and the essences according to the ratio to obtain a mixture B; directly adding the mixture B to the mixture A, and continuously stirring the mixture uniformly to prepare the environment improver. The environment improver can effectively remove moisture, odor and the like in a livestock and poultry farm and reduces incidence of respiratory diseases, can inhibit and kill bacteria, fungi, viruses and parasite ovum, and improves immunity of animals.