The invention discloses a rocky side slope ecological greening cultivation matrix, belonging to the vegetation cultivating technical field. The components and weight percentages of compositions of components of the matrix are as follows: 22-57 percent of organic matter, 2-5 percent of turf, 1-2 percent of grass fiber, 37-72 percent of raw soil or doras, 0-2 percent of rice chaff, 0.02-0.08 percentof water retention agent, 0.04-0.07 percent of caking agent and 0.04-0.07 percent of fertilizer. The invention has a reasonable distribution of each component and harmonious functions. The substitution of organic matter, grass fiber and rice chaff with low price and high quality for turf lowers cost. The additive fertilizer is mainly the slow release nitrogen fertilizer and the phosphate fertilizer and potash fertilizer are synthesized and mixed of different contents according to the nutrition characteristic of pioneer plant combination. Capable of supplying nutrition in the long run and stably and being popularized and applied in rocky side slope ecological greening project, the invention is characterized in light weight, a loose structure, good moisture retention and nutrient preserving.