The present invention relates to a natural simulated organic/inorganic composite material using boron nitride, the nanocomposite material of the present invention comprising boron nitride nano-platelets (BNNP), comprising: boron Nitride nanoplates (BNNP, Boron Nitride nanoplates); a polymer functional group including a side chain structure bonded to the boron nitride nanoplate; and from NH groups, NH2A linear polymer of one or more functional groups selected from the group consisting of a group, an OH group and a COOH group, wherein the functional groups crosslink the boron nitride nanoplate monomer bonded to the polymer functional group.