The invention discloses a nano calcium carbonate /wood composite material production method including the five steps of pretreatment of wood, preparation of a wood modifying agent, preparation of a wood modifying liquid, dipping treatment, and post drying treatment, and the wood modifying agent includes nano calcium carbonate, a surface active agent, water, sodium octoborate, diammonium phosphate, boric acid, ammonium molybdate, carbendazim, dodecyl dimethyl benzyl ammonium chloride, imidacloprid, and sodium dodecyl sulfate, and the surface active agent is one of fatty alcohol polyoxyethylene ether, polyoxyethylene amide, and sodium dodecyl benzene sulfonate. The beneficial effect is that the nano calcium carbonate /wood composite material production method has simple process, high efficiency, environmental friendliness and low cost and other advantages, and by use of the nano calcium carbonate for modification, the nano calcium carbonate /wood composite material has good enhancement, weighting, anti-erosion, stability improvement and the like.