In this paper, the effect of double-quenching on the surface hardness and heat treatment deformation of the roller skins was investigated using 9Cr2Mo steel roller skins for briquette machine, and the parameters of the double-quenching process were determined. The results show that by using the double-quenching method, the outer surface of the roller skin forms a hardness gradient distribution with high hardness in the middle and low hardness at the edges, and the heat treatment deformation of the roller skin is reduced and the service life is significantly improved.