The present invention provides a device and method for optimizing natural stone. The device comprises an electrolytic furnace comprising a furnace body having an opening at its top end; a seal cover which covers the opening of the furnace body in a movable manner to thermally insulate the furnace body; and a heating unit which is disposed in the furnace body to heat and optimize the natural stone placed in the furnace body; and wherein a hoisting equipment is provided outside the electrolytic furnace, allowing that the natural stone is moved into or out of the electrolytic furnace from the opening of the furnace body. The method provided by the present invention uses the foregoing device for optimizing natural stone to electrolyze the stone. The present invention may reduce the floor space of the electrolytic furnace, cut the generation cost of the electrolytic furnace and raise stone electrolysis efficiency.