SiC ceramics are prone to edge chipping during grinding. Real-time coating the grinding layer of SiC ceramics with a toughening agent is a new method to control the edge chipping. The toughening agent used in this research was prepared with E51 bisphenol A epoxy resin, anhydrous ethanol, 651 low relative molecular weight polyamide resin, and 1,8-diazabicycloundec-7-ene (DBU) as its main ingredients. By measuring the control angle, wetting depth, and curing time of the toughening agent on the surface of SiC ceramics, the effects of the concentration of the toughening agent ingredients and surface roughness of ceramics on the wetting performance and curing rate of toughening agent were explored, and a toughening agent with good wetting performance and rapid curing rate was obtained. The results show that the optimal mass ratio of the toughening agents m(E51 bisphenol A epoxy resin)∶m(anhydrous ethanol)∶m(651 low relative molecular weight polyamide resin)∶m(DBU) is 1∶0.9∶0.5∶0.02. Under this configuration, the toughening agent penetrates the SiC ceramics surface to a depth of about 40 μm within 160 s, which reduces the surface hardness of the SiC ceramics by about 25%. The wetting performance of the toughening agent increases with the increase of the amount of solvent or the increase of the surface roughness of SiC ceramics, which is found to be almost not affected by the amount of the accelerator. In addition, the curing rate of the toughening agent decreases with the increase of the amount of solvent, and increases with the increase of the amount of accelerator. However, when the amount of accelerator reaches saturation, the curing rate will no longer increase.