Combining mould of superhard composite blade and combining method using combining mould

The invention relates to a combining mould of a superhard composite blade and a combining method using the combining mould. The combining mould comprises a mould body, wherein the mould body is provided with a combining groove with the shape being identical to the whole shape of the combining superhard composite blade, a separating foil is arranged inside the combining groove, the edge of the top part of the separating foil is not lower than the opening edge of the combining groove, the separating foil is provided with a first foil surface used for surrounding and forming containing space of superhard material knife head powder with the corresponding side wall of the combining groove, the separating foil is also provided with a second foil surface used for surrounding and forming containing space of matrix powder with the corresponding side wall of the combining grove or the corresponding side wall of the combining groove and the corresponding foil surface of another separating foil, and each separating foil is made of the materials spreading to the alloy matrix powder and/or the superhard material powder during combining sintering or is arranged inside the combining groove to be taken out after the alloy matrix powder and the superhard material powder fill in the combining groove. The mould can reduce the manufacturing procedure of the superhard composite plate, and the pass percent is improved.