With respect to the iron-based metal powder used for ultrafast laser cladding provided by the present invention, its manufacturing method and application, among them, the chemical composition of the iron-based metal powder and its mass percentage are: C 0.6 to 1.0%, Cr 17.0 to 20.0%, Ni 5.0 to 6.5%, Mn 2.0 to 4.0%, Mo 1.0 to 1.5%, Ti 4.0 to 6.0%, B 1.0 to 1.5%, N 0.08 to 0.15%, Si≤0.5%, P≤0.030%, S≤0.030%, The remainder is Fe and unavoidable impurities. The said metal powder particle diameter is 15-65 micrometers, and fluidity|liquidity is 16-20 s/50g. The present invention also provides a method for reinforcing and restoring the surface of a shaft-type component substrate by applying the metal powder and matching various processes using ultrafast laser cladding technology.
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