The present invention discloses a self-repairing graphene-based pressure sensor and a preparation method thereof. A grapheme@silver nanowire composite conductor is added into a self-repairing macromolecule matrix to make a conductive elastomer having a self-repairing function; and the self-repairing conductive elastomer is packaged to a pressure sensor. The contradictory problem is solved that the conductivity and the conductivity and the self-repairing performance of the traditional self-repairing conductive polymeric materials are difficult to optimize at the same time. The self-repairing graphene-based pressure sensor and the preparation method thereof have the following advantages: 1, the drying processing is not needed in the grapheme@silver nanowire composite conductor postprocessing to reduce the hard-agglomeration problem of the grapheme@silver nanowire; the grapheme@silver nanowire composite conductor is easy to form a three-dimensional cross-linked network structure in the self-repairing polymer matrix; and the self-repairing graphene-based pressure sensor is long in life, high in conductivity and high in sensitivity.