NOVELTY - Method for preparing organic vegetable seedling tray matrix, involves using sawdust, cow manure, duck manure, floating aquatic plant powder, crushed corn cobs, perlite, vermiculite, ash, mulberry, pokeweed, toosendan, garlic powder, sodium alginate, potassium fulvic humate, indole butyric acid, sodium carboxymethyl starch, 12% sodium chloride solution, and fine soil.    USE - The method is useful for preparing organic vegetable seedling tray matrix (claimed) used for nursery seedling root system.    ADVANTAGE - The method is simple, and the prepared tray matrix is easy to use, and has good water retention and rich nutrient ingredients.    DETAILED DESCRIPTION - Method for preparing organic vegetable seedling tray matrix, involves (a) crushing sawdust, cow manure, duck manure,corn cobs and floating aquatic plant powder, stirring the crushed material with fine soil, controlling the moisture content to be 57-62%, fermenting, sterilizing and adding preservatives, (b) immersing mulberry, pokeweed, Toosendan and garlic powder in water for 2-4 hours, heating and extracting for three times, combining the extracts, concentrating the combined extract, adding 95% ethanol to the concentrate to precipitate water-soluble impurities, filtering, centrifuging and UV-sterilizing to obtain traditional Chinese medicinal extract, (c) adding ash to the traditional Chinese medicinal extract, adding water (3-5 times the mass of ash), mixing, sedimenting, removing upper supernatant and residue, and sterilizing to obtain the processed extract, (d) immersing sodium alginate, potassium fulvic humate, perlite, indole butyric acid and sodium carboxymethyl starch in 12% aqueous sodium chloride solution for 3-5 days, and pelletizing to obtain 100-130 mesh pellets, (e) immersing vermiculite in the extract obtained in the step (c) for 3-5 days to obtain 120-150 mesh particles, or spraying the processed extract such that the total mass of the resulting vermiculite is 1.5-3%, and (f) mixing the crushed materials obtained in the step (a) with the products obtained in the steps (d) and (e) in a mass ratio of 8:1:1.