The invention relates to a wear-resistant additive for lubricating oil. The additive comprises the following components in parts by mass: 1-5 parts of nano calcium carbonate, 2-4 parts of nano boron nitride, 3-6 parts of nano molybdenum disulfide, 2-8 parts of expanded graphite, 3-6 parts of nano cerium borate, 1-5 parts of nano zirconium oxide, 2-8 parts of nano aluminum oxide, 1-6 parts of nanotitanium dioxide, 1-8 parts of nano silicon dioxide, 3-5 parts of N,N'-di-sec-butyl-p-phenylenediamine, 4-6 parts of di-tert-butyl-p-cresol, 2-5 parts of polyvinyl alcohol, 2-8 parts of methyl acrylate, 1-5 parts of pentaerythritol, and 2-8 parts of nano zinc oxide. The ceramic-like layer formed by the additive for the lubricating oil provided by the invention has ultra-high hardness and super wear resistance, and the overhaul period of an engine is prolonged; and the additive has the advantages of having good lubricating performance, saving oil, reducing jitter, reducing engine noise, promoting power, alleviating or thoroughly treating the phenomenon of burning engine oil, and reducing harmful gases in tail gases.