The invention discloses a composition containing montmorillonite and application of the composition. The composition comprises 100 parts of montmorillonite, and also comprises but is not limited to one or more of the following raw materials: 0 to 5 parts of sodium diacetate, 0 to 5 parts of potassium sorbate, 1 to 20 parts of vitamin C1, 1 to 20 parts of vitamin B1, 1 to 20 parts of vitamin B2, 1 to 20 parts of vitamin B6, 1 to 20 parts of nicotinamide and 1 to 20 parts of sodium dextropantothenate. The composition is used for inhibiting mould breeding in a feed, adsorbing mycotoxin, controlling animal food positioning caused by acute and chronic poisoning, breeding disorder, infection introducing and residual toxin of an animal body, which are caused by mycotoxin and the like, improving feed intake and promoting weight increment.