The TiN-reinforced TiN/FGH4097 alloy was prepared by selective laser melting (SLM) method. The microstructure and mechanical properties of the alloy were tested by heat treatment with different aging processes. Results show that a large number of fish scales are formed on the surface of formed FGH4097 alloy. The dispersed TiN particles were formed in the formed TiN/FGH4097 alloy, which achieved good bonding property with the matrix and formed shorter dendrites. After solid-solution aging (SA) treatment, Laves phase solution occurred in the matrix, and a large number of fine needle tissue and δ phase were precipitated. After TiN/FGH4097 homogenization solid-solution aging (HSA) treatment, a large number of needle-shaped δ phases were generated in the matrix, and a significant Characteristic peak of Ti2N was formed. The hardness of TiN/FGH4097 sample increases by 38 HV. Double aging (DA) heat treatment results in a significant increase in hardness. The tensile strength of TiN/FGH4097 specimen increases by 75 MPa, while the elongation decreases. The shape alloy formed dimples with larger size and depth, and the HSA heat treatment formed smaller dimples. This study has great theoretical reference significance for further optimization of SLM additive manufacturing of nickel-based superalloy.