The invention discloses a vacuum circuit breaker and a fabrication method thereof. The connection face of a heat sink and/or a surface of a conductive loop of the vacuum circuit breaker is/are coated with a graphene layer. By fabricating the graphene layer on connection surface of the heat sink and/or surfaces of all parts of the conductive loop of the vacuum circuit breaker, heat conduction and dissipation are accelerated; and meanwhile, in this way, the heat is accelerated to be conducted to the heat sink from the conductive loop, the heat conductivity of the conductive loop is improved, and the temperature rise of the vacuum circuit breaker can be reduced to 3-10 DEG C.