▎ 摘　　要

NOVELTY - Mobile terminal back board comprises heat conductive layer (100) containing graphene or graphene oxide, and a thermoplastic resin, strength layer (200), where strength layer is disposed on one surface of the heat conductive layer, and contains glass fiber powder and the thermoplastic resin, protective layer (300) disposed on a surface of the strength layer away from the heat conductive layer, and protective layer contains diamond and the thermoplastic resin. USE - Mobile terminal back board used in mobile terminal (claimed). ADVANTAGE - The mobile terminal back board has simple structure, is easy to implement, has high yield, low cost, large toughness, high damage tolerance, large hardness, good impact resistance, high temperature resistance, good flame retardant performance, high relative dielectric constant, strong anti-signal shielding capability, and meets the technical requirements of 5G communication. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a mobile terminal back board, which involves: (A) subjecting raw material forming the heat conductive layer to a first extrusion treatment to obtain a first sheet; (B) subjecting raw material forming the strength layer to a second extrusion treatment to obtain a second sheet; (C) subjecting raw material forming the protective layer to a third extrusion treatment to obtain a third mixed sheet; and (D) subjecting first sheet, the second sheet, and the third sheet to hot press molding to obtain the mobile terminal back board. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of mobile terminal back board. Heat conductive layer (100) Strength layer (200) Protective layer (300)