The invention relates to an automatic sharpening system for polycrystalline diamond cutting tool with indexable inserts. The automatic sharpening system for the polycrystalline diamond cutting tool with the indexable inserts comprises a grinding machine, an adjustable upper pressing type cutter bar, an image detection head and a computer. Image acquisition processing software, cutting tool geometry size data processing software, machine tool program control software and an operating system are arranged in the computer. The adjustable upper pressing type cutter bar is mounted on the grinding machine, the image detection head is mounted on the adjustable upper pressing type cutter bar, the image detection head is connected with the computer, and the image detection head comprises a lens, a CCD camera and a light source. The clamping of a plurality of superhard cutting tools with the indexable inserts on a sharpening grinding machine bed is achieved, the tedious manufacturing process thateach cutting tool is provided with one clamping tool is avoided; and meanwhile, materials required for manufacturing are greatly saved, and the automatic sharpening system for the polycrystalline diamond cutting tool with the indexable inserts has the advantages of high machining efficiency, material saving, time saving and labor saving.