Pteris multifida and colistin-containing compound drug for livestock and poultry

The invention relates to a pteris multifida and colistin-containing compound drug for livestock and poultry. The pteris multifida and colistin-containing compound drug is composed of the following raw materials in parts by weight: 3-30 parts of colistin and 5-200 parts of pteris multifida. After the pteris multifida is added into the colistin, the drug resistance of bacteria to the colistin can be reversed, so that the treatment effect of the colistin is improved. The compound drug is prepared into powder, tablets, an oral solution or granules according to a conventional method and is fed to livestock and poultry after being added into a feed for livestock and poultry according to the dosage that 0.1-7g of a main drug is added in every kilogram of the feed, so that the medication cost and drug residues can be greatly reduced, a higher economic benefit is created for a farmer, and meanwhile, the food safety is ensured.