The invention discloses an efficient cooling grinding assembly of a diamond, The assembly comprises a mounting seat, a plurality of fixing pieces and a plurality of grinding pieces, wherein each grinding piece comprises a mounting part and a working part, and diamond particles are mixed in the working parts of the grinding pieces; the fixing pieces are the same as the grinding pieces in shape, thefixing pieces are in arc shapes, and the arc-shaped protruding direction of the fixing pieces is the same as the rotating direction of the mounting seat; the plurality of fixing pieces are arranged on the mounting seat, arc-shaped mounting grooves are formed in the fixing pieces, and openings of the mounting grooves face downward; the mounting parts of the grinding pieces are inserted into the mounting grooves in a matched mode, a plurality of heat dissipation holes are formed in the mounting parts of the grinding pieces, a plurality of air holes are formed in the fixing pieces, and the plurality of heat dissipation holes are in one-to-one correspondence with the plurality of air holes; and the lower end faces of the working parts of the plurality of grinding pieces are located in the same horizontal plane, a plurality of air inlet holes are formed in the mounting seat, and the air inlet holes are located between two adjacent fixing pieces. According to the assembly, the grinding effect is good, the heat dissipation is fast, the slag discharge is rapid, and the quality and the effect of grinding are improved.