The invention belongs to the technical field of design and manufacturing of millimeter wave band power dividers. A novel metal waveguide-substrate integrated waveguide power divider comprises a substrate integrated waveguide and a metal straight waveguide; the substrate integrated waveguide comprises a bottom copper clad layer, a dielectric layer and a top copper clad layer stacked in sequence from bottom to top and two rows of metal holes penetrating through the bottom copper clad layer, the dielectric layer and the top copper clad layer; the power divider is characterized in that the bottom copper clad layer of the substrate integrated waveguide is further provided with a feed port, the feed port is located in the center of the substrate integrated waveguide and is kept consistent with the metal straight waveguide in size, and the metal straight waveguide vertically feeds electricity to the substrate integrated waveguide via the feed port. The power divider simplifies the feed structure and reduces the size in term of the structure, thereby facilitating system integration and miniaturization; the power divider improves the feed efficiency and reduces the loss from electrical performance; meanwhile, same-phase/ opposite-phase output of the output port can be designed according to actual needs.