The invention discloses a method for preparing high-performance polycrystalline diamond by utilizing a hinge-type cubic press. The method is characterized in that diamond or diamond-containing carbon powder are taken as raw materials, and any metal or ceramic binder is not added. After purification, the powder surfaces are purified for 0.5 h-5 h at a vacuum degree of 4*10<-3>-4*10<-5> Pa, at the temperature of 800-1500 DEG C. The diamond powder with purified surfaces is pre-formed, placed on the hinge-type cubic press, sintered for 1-30 min at the temperature of 1400-2500 DEG C, under the pressure of 8-20 GPa to prepare high-performance polycrystalline diamond block materials. The high-performance polycrystalline diamond is single in phase, chemical bonds are formed among crystal grains, and integrated closely on a large scale to form high-strength diamond- diamond interfaces. The high-performance polycrystalline diamond is almost the same as natural diamond monocrystalline in hardness, and is better than binder-containing artificial polycrystalline diamond in heat stability and hardness.