The invention belongs to the field of metal alloy materials, and relates to a CoCrNiCuFeMnAl high-entropy alloy, which comprises cobalt powder 5.2-38.03wt.%, chromium powder 4.5-34.53wt.%, nickel powder 5.17-37.92wt.%, copper powder 5.68-40.25 wt.%, iron powder 0.2-20.61wt.%, manganese powder 0.5-33.45wt.% and aluminum powder 0.3-20.03wt.%. The preparation method is to mechanically alloy the above metal elemental powder in a ball mill, and then The obtained high-entropy alloy powder is pre-pressed and annealed, and then hot-pressed and sintered, and the sintered body is annealed, and finally the surface of the annealed sintered body is ground and polished to remove external impurities remaining in the sample sintering And the burrs generated on the edge during the sintering process, so as to prepare the CoCrNiCuFeMnAl high-entropy alloy bulk material. Compared with traditional alloys, the high-entropy alloy of the invention has better compactness, hardness and compressive strength.