The invention relates to a diamond fret saw, which comprises a fret saw inner core, wherein the fret saw inner core is formed by mutually twisting more than two strands of metal wires; a metal layer is plated on the surface of the fret saw inner core; the surface of the metal layer is fixedly provided with abrasive grains; and the abrasive grains are diamond particles, other wear-resistant material particles, or mixture of diamond particles and other wear-resistant material particles. The continuous production technology of the diamond fret saw provided by the invention has the advantages of being reasonable in flow, high in yield and the like, and the diamond fret saw can be continuously produced.