Diamond-impregnated drill bit manufacturing die, manufacturing method and diamond-impregnated drill bit

The invention provides a diamond-impregnated drill bit manufacturing mold and method.The manufacturing mold comprises an insulating outer core, a steel bottom mold and an insulating inner core which are sequentially and coaxially arranged in a sleeved mode from outside to inside, and the steel bottom mold comprises an annular cylindrical section and a plurality of steel forks distributed in the circumferential direction of the upper surface of the annular cylindrical section at intervals; a graphite pressing head is installed between every two adjacent steel forks, a certain distance is formed between the lower end face of each graphite pressing head and the upper surface of the annular cylindrical section, and a charging space used for containing carcass powder is formed. The graphite pressure head is designed, when resistance heating is carried out, current can be equivalent to an electric body of resistance sintering, the current sequentially flows through the graphite pressure head, matrix powder and a st