The invention discloses a multi-bit orientation doping in-situ carbon coated lithium-rich oxide solid solution material and a preparation method thereof. The preparation method comprises the followingsteps: preparing and obtaining a multi-bit orientation doping in-situ carbon coated Li2MnO3 unit through a coprecipitation method and a high-temperature roasting technology; then, preparing and obtaining a pure-phase nickel-cobalt-manganese ternary layered unit through the coprecipitation method and the high-temperature roasting technology; and finally, doping the coated Li2MnO3 unit and the nickel-cobalt-manganese ternary layered unit through high-speed mixing and high temperature aftertreatment to obtain the final product. The material has the main beneficial effects that the structural stability of the material is improved by carrying out multi-bit orientation doping on Li, Mn and O sites in the Li2MnO3 unit; and the electronic conductivity of the material is improved through carbon coating.