With waste residue of artificial granite as raw materials, calcium formate crystals was synthesized by neutralization method. The effects of the ratio of the mass ratio of artificial granite waste residue to formic acid, the reaction time, the stirring speed, and the reaction temperature on the utilization of artificial granite slag were analyzed and characterized by SEM, XRD and infrared spectrometer. The results show that the optimum technological conditions for the synthesis of calcium formate from artificial granitic waste residue are as follows: the mass ratio of artificial granitic waste residue to formic acid is 1.0∶1.3, the reaction temperature is 50 ℃, the stirring speed is 430 r/min, the reaction time is 50 min, the volume of sulfide precipitator is 0.15 mL, and the removal rate of iron ion is 98.77%, the yield of calcium formate is 94.20% by complex titration and redox titration. The characterization results show that the artificial granite waste residue presents an irregular shape, the surface is relatively smooth; the product presents the shape of polyhedron with an average particle size is 1 μm, indicating that the synthesized product is gradually grown and molded according to a certain crystal form, and the main product is calcium formate crystals combined with infrared spectroscopy and energy spectrum analysis.