The invention provides a soil-fixing fertility type matrix suitable for vertical green walls. The soil-fixing fertility type matrix is prepared from 25-40 volume parts of coco coir, 5-20 volume parts of turf, 10-20 volume parts of edible mushroom residues, 5-15 volume parts of mountain sand, 5-15 volume parts of vermiculite and 15-35 volume parts of zeolite. Ideally, the pH is 5.5-7.8, the EC is less than 3mS/cm, the water content is 30-50%, the content of organic matter is greater than 25%, the dry bulk density is 0.4-0.85Mg/m<3>, the wet bulk density is 0.65-1.25Mg/m<3>, and the total nutrient content is 2-5%. The invention also provides a method for preparing the soil-fixing fertility type matrix suitable for vertical green walls. The matrix has water-retaining property and fertilizer-retaining property, has the advantages of high nutrient content, low maintenance and slow nutrient loss, is suitable for urban vertical green walls and roof greening and plays an active role in improving urban ecological environment quality.