The invention relates to a two-component modified epoxy adhesive for stone combination and a preparation method thereof, which is characterized in that an A component is prepared by bisphenol A epoxy resin, bisphenol F epoxy resin, an active diluent, a bisphenol A, an anti-yellowing additive, a wetting agent, and inorganic powder, and a B component is prepared by self-made ketoimine, nonyl phenolglycidyl ether modified aliphatic amine, alicyclic amine, a coupling agent, a wetting agent, and a curing accelerator; the A and B components are mixed and used according to a mass ratio of 10:2.5-5.In the ketoimine preparation, the mass ratio of butanone to diethylenetriamine is 70-90:100; in the modified aliphatic amine preparation, the mass ratio of nonyl phenol glycidyl ether to diethylenetriamine is 100:21-32; the two-component modified epoxy adhesive for stone combination has the characteristics of good curing performance, and low cost.