NOVELTY - Producing Trichoderma bioagent from potato starch waste water and mushroom residue, comprises e.g. taking high-concentration organic waste water and mushroom residue as main culture medium raw materials, taking Trichoderma strain normal agricultural bio-control strain comprising Trichoderma viride, Trichoderma harzianum and Trichoderma atroviride, steriziling potato starch waste water and then cooling and inoculating Trichoderma strain and inoculating the culture medium with concentration of 106-107 spores/ml.    USE - The method is useful for producing Trichoderma bioagent from potato starch waste water and mushroom residue.    ADVANTAGE - The method is capable of economically, rapidly and efficiently producing Trichoderma bioagent from potato starch waste water in an environmentally friendly manner.    DETAILED DESCRIPTION - Producing Trichoderma bioagent from potato starch waste water and mushroom residue, comprises taking high-concentration organic waste water and mushroom residue as main culture medium raw materials, taking Trichoderma strain normal agricultural bio-control strain comprising Trichoderma viride, Trichoderma harzianum and Trichoderma atroviride, steriziling potato starch waste water at 115-126 degrees C for 15-30 minutes and then cooling and inoculating Trichoderma strain, inoculating the culture medium with concentration of 106-107 spores/ml, shaking the water at 20 degrees C-35 degrees C with the speed of 120-200 revolutions per minute for 24-48 hours to obtain liquid seed, taking potato starch waste water into the fermentation tank at 115 degrees C-126 degrees C, sterilizing the water for 15-30 minutes, cooling at room temperature, inoculating 2-20% of seed liquid at 20 degrees C-35 degrees C, aerating and aerobic culturing the seed liquid for 24-72 hours to obtain liquid Trichoderma product, taking mushroom as the support, adding the cultured liquid seed or liquid Trichoderma product for 2.5-4 times into the mushroom residue, uniformly stirring the mixture at 20 degrees C- 35 degrees C, static culturing the mixture for 3-15 days to obtain the solid Trichoderma product, and drying the solid Trichoderma fermentation product, controlling water content of solid to less than 30% and then packing the product.