The invention overcomes the defect of the prior art and provides a high-entropy alloy in-situ preparation method and product by laser additives, FeCoCrNiTi high-entropy alloy powder preparation and in-situ laser additive fabrication are realized, microphase composition of an original sample is changed, and the hardness of the original sample is successfully improved. The method comprises the stepsof raw material mixing, additive preparing and aging treating. Materials prepared adopting the method are high in shaping efficiency and can be used for preparing parts in complex shapes. By means ofthe high-entropy alloy in-situ preparation method and product by the laser additives, near-net shaping of the materials can be realized, and the production cost of the parts is greatly lowered; the sample shaping effect is good, no pore and macroscopic cracking exist, the sample has no micropore and microcrack and has good density and relatively uniform tissue, and three phase structures coexist;and after high-temperature aging treatment is performed, precipitates are all converted from net shapes to plate strip shapes, obviously, just because of this conversion, the hardness of the sample is improved after the high-temperature aging treatment is performed, and the hardness of the sample cooled by quenching is higher than that of the sample cooled along with a furnace.