The invention relates to a die-casting mold of a metal junction box. The die-casting mold comprises a left mold and a right mold which can be closed and separated, wherein two mold cavities are formedwhen the left mold and the right mold are closed; the two mold cavities are sequentially arranged along the vertical direction and symmetrically arranged relative to a horizontal plane located between the two mold cavities; a parting surface between the left mold and the right mold penetrates through positions, which are corresponding to openings of a main body and a communicating pipe, of the mold cavities; a metal liquid converging groove which is communicated with an inlet passage is arranged in the positon, between the two mold cavities, of the left mold; the metal liquid flow converginggroove is provided with liquid inlet channels which are respectively communicated with the mold cavities; waste and exhaust gas channels extending to the edge of the left mold are arranged in the moldcavities; the left mold and the right mold are respectively provided with fixed mold cores which are arranged in the mold cavities; and the left mold is provided with movable mold cores which are faraway from the mold cavities during stripping. By adopting the scheme, the die-casting mold of the metal junction box has the advantages of increasing the production efficiency and guaranteeing the aesthetic property and the strength of a finished product.