The invention relates to a self-purifying planting type water-permeable slope protection material and a preparation method thereof. The self-purifying planting type water-permeable slope protection material comprises a self-purifying planting type water-permeable concrete base layer and a photocatalyst coating, wherein the self-purifying planting type water-permeable concrete base layer comprisessilicate-titanium salt slurry, cement strengthener and an active porous material; and the photocatalyst coating is sprayed on the self-purifying water-permeable concrete base layer, and the amount ofthe photocatalyst coating is 2.0 to 7.0 L/m<2>. The self-purifying planting water-permeable slope protection material can degrade organic pollutants in river water or reduce the heavy metal entering the underground water by permeating into the soil, and is high in strength and suitable for the growth of plants.