The invention belongs to the technical field of aldehyde elimination, and provides a nano oxidation aldehyde-free floor, a production method thereof, a nano oxidation aldehyde-eliminating liquid and aeucalyptus-rosemary nano aldehyde-eliminating liquid. The nano oxidation aldehyde-eliminating liquid is prepared by compounding modified chitosan, an osmotic agent, 2-imidazolidinone, nano zinc oxide, nano silicon oxide, and deionized water according to a certain ratio; and has the advantages of strong adhesion force, excellent permeability, good aldehyde-eliminating effect, and long acting effect. The eucalyptus-rosemary nano aldehyde-eliminating liquid is prepared by compounding the nano oxidation aldehyde-eliminating liquid, eucalyptus leaf oil, and rosemary oil according to a certain ratio and is capable of reducing released formaldehyde, killing bacteria and mites, and preventing mold. By adding the eucalyptus-rosemary nano aldehyde-eliminating liquid during the process of hot-pressing a fiber board and decorative paper, the amount of released formaldehyde is reduced, and at the same time, the product has the functions of killing bacteria and mites, and preventing mold. Furthermore, nano oxidation aldehyde-eliminating liquid is sprayed on or roller-painted on the surface, back face, groove and tongue of a product to further control the amount of released formaldehyde.