The invention discloses a packaging method for a graphene high-temperature pressure sensor. The graphene high-temperature pressure sensor mainly structurally comprises a nanometer film, a substrate, interconnection electrodes, interconnection bumps, interconnection bonding pads, sealing rings, a packaging shell, a ceramic base, a lead column and an oxygen-free vacuum cavity. The upper surface of the substrate is etched to form an inverted trapezoidal structure, and a nanofilm is arranged on the lower surface of the substrate, the nanofilm is formed by two layers of boron nitride and graphene sandwiched between the two layers of boron nitride, and the boron nitride can provide an attached carrier and isolation protection for graphene. An Au-Au direct bonding technology is adopted to enablethe substrate and the base to form the vacuum cavity, an oxygen-free environment is provided for the nanofilm, and sealing can be kept at 900 DEG C. According to the packaging method, the packaging structure is reliable, and the usage temperature of the sensor is guaranteed to be increased to 900 DEG C in an oxygen-free vacuum environment.