The invention relates to the technical field of wood surface modification, in particular to a method for modifying surface hardness of fitment wood. The surface of the fitment wood is polished through abrasive paper, modified epoxy resin paint containing 2-6% by weight of CaSiO3 is painted on the surface for at least four times, the painting thickness of each time is 0.01-0.02 mm, the fitment wood is placed at the room temperature for 20-30 min after each time of painting and then the next time of painting is conducted, and the fitment wood is placed at the temperature of 30-38 DEG C for 5-8 days after the last time of painting is conducted. The fitment wood is placed for a long time after the multiple times of painting, the paint can enter the wood surface layer for 0.1-0.2 mm, the surface hardness is remarkably improved at last, and the fitment wood has good scratch resistance.