Garden engineering soil matrix prepared by fermenting garden waste and kitchen garbage

The invention discloses a garden engineering soil matrix prepared by fermenting garden waste and kitchen garbage, which is prepared by the following steps: S1, crushing and sieving the garden waste, and mixing the garden waste with the kitchen garbage according to a ratio of 4: (2-3) to obtain a mixture; s2, performing aerobic fermentation stack retting on the mixture obtained in the step S1 for 35-45 days to obtain a compost product; s3, bentonite, compound ammonium nitrate and microbial strains are added into the compost product, the moisture in the compost product is adjusted to be 50-60%, then the compost product is stirred and mixed for 4-6 min through a stirrer, then discharging, stacking and curing are conducted for 3-7 days, and the modifier is obtained. A large number of fungus microorganisms contained in the prepared soil matrix can generate a large number of polysaccharide substances after entering soil, the polysaccharide substances are organically and alternately combined with secretions on the s