A cobalt-removed polycrystalline diamond compact, and in particular a polycrystalline diamond compact having an annular cobalt-removed shape. The compact comprises two layers, i.e., a working layer made of polycrystalline diamond and a support layer made of a hard alloy. The polycrystalline diamond layer is formed by sintering at a high temperature under a high pressure using metal cobalt as a binder; the polycrystalline diamond layer has an annular cobalt-removed layer, the cobalt-removed layer comprising a PCD surface and outer edge. The cobalt-removed polycrystalline diamond compact has a simple structure, and can reduce residual stress in the polycrystalline diamond layer so that the abrasion resistance, impact resistance and thermal stability of the cobalt-removed polycrystalline diamond compact are greatly improved; therefore, the service life of the compact is prolonged and the effects of cobalt removal on the environment can be reduced.
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