Hard alloy coated diamond particle and preparation method thereof

The invention provides hard alloy coated diamond particles and a preparation method thereof.The preparation method comprises the steps that S01, a hard alloy mixture is prepared by mixing WC powder materials and Co powder materials, an alcohol solvent and paraffin are added into the hard alloy mixture, stirring and mixing are conducted to obtain first slurry, diamond particles are added into the first slurry, stirring and mixing are conducted, and a second slurry is obtained; obtaining second slurry containing diamond particles; s02, the second slurry is added into spray drying equipment, and spherical or sphere-like first particles of diamond wrapped by hard alloy mixed materials are obtained after treatment; s03, the first particles are placed in a vacuum sintering furnace to be sintered, and hard alloy coating layers are formed on the surfaces of the diamond particles; and S04, sintering blocks obtained after sintering in the vacuum sintering furnace are put into a crushing sieve, and the dispersed hard al