Polycrystalline diamond composite material grinding device

A polycrystalline diamond composite material grinding device comprises a mortar, the mortar comprises an alms bowl and a bowl rod, the alms bowl comprises a hard alloy base body, the whole hard alloy base body is in an inverted cone frustum shape, an opening in the upper portion of the hard alloy base body is a spherical-crown-shaped groove, and a grinding layer made of polycrystalline diamond materials is arranged on the inner wall of the spherical-crown-shaped groove; the pot rod comprises a hard alloy rod base body, the lower portion of the hard alloy rod base body is in a cone frustum shape, the bottom end face of the hard alloy rod base body is in a convex spherical crown shape, a grinding layer made of polycrystalline diamond is arranged on the periphery of the convex spherical crown-shaped face at the bottom end of the hard alloy rod base body, and the top of the hard alloy rod base body is upwards connected with a handle. The upper part of the hard alloy rod substrate is in threaded connection with th