The invention discloses a composite volcanic rock absorbent which is characterized in that the absorbent is prepared from the following raw materials, by weight: 8-15 parts of calcium carbonate fiber, 6-8 parts of iron tetroxide magnetic powder, 20-40 parts of tetrabutyl titanate, 3-5 parts of silica sol, 6-8 parts of calcium aluminate, 60-80 parts of volcanic rock, 6-9 parts of PA6 nylon powder, 3-4 parts of gelatin, 1-3 parts of ammonium bicarbonate, 5-8 parts of vermiculite powder, and deionized water. According to the invention, with the added vermiculite powder and iron tetroxide magnetic powder, volcanic rock absorbability, high-temperature resistance and fire resistance are enhanced; and an absorption range is expanded. The absorbent provided by the invention has good absorption characteristics in various fields and especially in the aspects of sewage treatment, oil pollution treatment and the like. The absorption efficiency is high, and the absorbent is easy to remove. The absorbent has a good reutilization effect, and has a good application prospect.