Food residue activated carbon for wastewater treatment, and preparation method of food residue activated carbon

The invention discloses food residue activated carbon for wastewater treatment. 100% of food residue serves as a raw material, and is air-dried by 12-24h; the dried food residue is obtained, put in a microwave oven at 200-800 DEG C, and carbonized in a nitrogen atmosphere; the prepared carbonized material is placed in an activating oven for activation at 200-1000 DEG C; and the activated carbon is prepared. According to the activated carbon, the activated carbon is prepared by the food residual for the first time; the energy is saved; the preparation cost of the activated carbon is lowered; and the activated carbon is used for decolorizing wastewater and removing heavy metal simultaneously, so that a purpose of treating waste with waste is achieved.