NOVELTY - Celery seedling matrix comprises fermented vegetable residue, biogas residue and calamine. The fermented vegetable residue comprises tomato residue, potato stump and cabbage stump. The biogas residue is prepared by adding corn straw and chicken manure, adding anaerobic strain and carrying out fermentation. The vegetable residue is prepared by pulverizing vegetables, adjusting carbon/nitrogen ratio and water content, adding strain and carrying out fermentation to obtain vegetable residue, where residues are dead plant or plant tissue left out in fields.    USE - As celery seedling matrix.    ADVANTAGE - The celery seedling matrix is environmentally-friendly and cost-effective, has improved physical and chemical properties, replaces peat with biogas residue and thus protects biogas residue resources, increases vegetable residue and corn straw resource utilization and hence has ensured merchandise performance.    DETAILED DESCRIPTION - Celery seedling matrix comprises vegetable residue, biogas residue and calamine in volume ratio 6-8:3-5:2-4. The fermented vegetable residue comprises tomato residue, potato stump and cabbage stump in volume ratio 2:3:2. The biogas residue is prepared by mixing corn straw and chicken manure in mass ratio 7.5:1, adding anaerobic strain and carrying out fermentation. The fermented vegetable residue is prepared by pulverizing vegetables, adjusting pulverized vegetables carbon/nitrogen (C/N) ratio to 24:25 and water content to 58-62%, adding 0.6% strain with viable cell count greater than or equal to 2x 109 colony forming units (CFU)/g with respect to the total weight of vegetable residue and carrying out fermentation to obtain vegetable residue, where residues are dead plant or plant tissue left out in the fields after picking the fresh vegetables. An INDEPENDENT CLAIM is included for method for preparing the matrix which involves (a) carrying out the above-mentioned process and decomposing by turning 2 days once until the center temperature is below 32 degrees C to obtain dark pulverized vegetable residue, (b) crushing the corn straw to 1-2 cm, adding crushed corn straw, chicken manure and water, stirring into paste, adding 0.2 anaerobic strain, stirring, mixing by high pressure pump to constant temperature of 28 degrees C and fermenting to obtain byproduct and (c) mixing vegetable residue, biogas residue and calamine in mass ratio 7:4:2 and adjusting pH value to 6.1-6.3.