NOVELTY - A trichoderma hamatum biological preparation is prepared by: a) preparing trichoderma hamatum amplification culture strain, b) preparing trichoderma hamatum seed fermentation liquor, c) preparing solid fermentation culture medium, d) preparing trichoderma hamatum ferment, e) grinding ferment and wheat bran respectively, passing ground materials through 60-80 mesh sieve, f) subjecting diatomite, chitosan, potassium dihydrogen phosphate, Jiandibao (a pesticide with main component of biochemical fulvic acid) and materials to dry blending, uniformly stirring and fully mixing materials.    USE - As trichoderma hamatum biological preparation for controlling greenhouse vegetable soil-borne disease (claimed).    ADVANTAGE - The method is simple, has low cost, and the trichoderma hamatum biological preparation obtained effectively controls greenhouse vegetable soil-borne disease, improves and activates soil, improves soil microecological environment, induces and increases broad spectrum disease resistance of crops and improves growth and development of crops. The biological preparation is free from pollution and nuisance and wide in utilization range. The raw material does not contain any chemical component, and the crop is safe and harmless.    DETAILED DESCRIPTION - A trichoderma hamatum biological preparation is prepared by a) preparing trichoderma hamatum amplification culture strain by: inoculating the stored trichoderma hamatum on potato dextrose agar (PDA) slant medium to activate, placing the PDA plate in a biochemical incubator at 28 degrees C to culture for 3-5 days, obtaining the trichoderma hamatum amplification culture strain until a large amount of conidia appear, where the PDA culture medium is prepared from peeled potatoes (200 g), glucose (20 g) and agar powder (10 g) which are added with water to 1000 ml; b) preparing trichoderma hamatum seed fermentation liquor: after mixing peeled potatoes (200 g), glucose or sucrose (20 g) and water (1000 ml), regulating the pH value to 5-6 to prepare the fermentation culture liquid, packing the fermentation culture liquid in triangular flasks (300 ml) each containing liquid (150 ml), sterilizing the flasks at 121 degrees C for 30 minutes, beating the trichoderma hamatum amplification culture strain obtained in step (a) into 5 mm blocks and inoculating the blocks in 150 ml of the fermentation culture liquid to conduct shaking culture at 26 degrees C and 160 revolution per minutes (rpm) for 5-7 days so as to obtain the trichoderma hamatum seed fermentation liquor; c) preparing solid fermentation culture medium: sterilizing the mixture of wheat bran (5-10 wt.%), corn flour (10-18 wt.%), coarse bran (15-25 wt.%) and the rest of water at 121 degrees C for 40 minutes to obtain the solid fermentation culture medium; d) preparing trichoderma hamatum ferment: mixing the seed fermentation liquor obtain in step (b) with the solid fermentation culture medium obtained in step (c) in the ratio of 1:5-10, stirring uniformly and covering with sterile paper, placing the mixture a growth cabinet at 25 degrees C and at the relative humidity of more than 85% to culture for 4-6 days, stirring once or twice during the culture to make the green strains overgrow on the solid uniformly, drying at 32 degrees C or drying in air after fermentation, obtaining and packing the solid trichoderma hamatum ferment, putting it in cooling place for later use; e) grinding the trichoderma hamatum ferment obtained in step (d) and wheat bran respectively, passing the ground materials through a 60-80 mesh sieve; f) subjecting diatomite, chitosan, potassium dihydrogen phosphate, Jiandibao (a pesticide with the main component of biochemical fulvic acid) and the materials obtained in step (e) to dry blending, uniformly stirring and fully mixing the materials to obtain light green powder which is determined that the conidium content is more than 10 to the power of 8 per gram.