The invention relates to a manufacturing method of an inner bore cooling polycrystalline diamond (PCD) thread high-speed forming cutter, belonging to the technical field of machining. The method comprises the following steps: carrying out abrasive machining on a hard alloy cutter body, punching cooling bores in the hard alloy cutter body, carrying out PCD chip welding, and finally carrying out wire cutting on the PCD chip by using a slow wire cutting machine, thereby obtaining the cutter. The invention realizes high-efficiency precision manufacturing technique of a hard alloy straight-shank straight-channel welded-type inner bore cooling PCD thread high-speed forming cutter.