PURPOSE: A processing method of volcanic rock is provided to improve the beauties of the volcanic rock by flatly finishing up the surface of the volcanic rock before solidification, thereby removing large pores, and suppress generation of surface cracks due to rapid cooling by heating and cooling the volcanic rock in stages. CONSTITUTION: The processing method of volcanic rock comprises cutting process of forming the collected volcanic rock in a rectangular or circular plate shape by collecting porous volcanic rock; preheating process of heating the cut workpiece in the temperature range of 300 to 500 deg.C for 0.5 to 1 hour; finishing process of uniformly smoothing the surface of the workpiece before it is solidified by melting the workpiece in the temperature range of 2500 to 3500 deg.C of the surface of the workpiece and slowly cooling the workpiece; slow cooling process of slowly cooling the workpiece to prevent generation of cracks on the workpiece after the surface of the workpiece is solidified; and cleaning process of removing foreign materials adhered onto the surface of the workpiece.
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