A method for directly 
seedling dendrobe seedlings by using a plastic 
greenhouse comprises the following steps: constructing a 
greenhouse; making a 
seedling bed; preparing a base material and performing sterilization, which can be realized by mixing pine barks and sheep 
manure, filtering the pine barks and the sheep 
manure through a screen after completely fermenting the pine barks and the sheep 
manure, soaking the pine barks and the sheep manure by using 
carbendazim, spreading the pine barks and the sheep manure on the 
seedling bed, placing the pine barks and the sheep manure on the seedling 
bed for 5-10 days, and controlling the 
water content; inoculating the 
symbiotic bacteria, which can be realized by taking a two years old base material of the dendrobe and uniformly scattering the two years old substrate on the seedling bed on which a new substrate is laid; pre-treating seeds, which can be realized by completely moisturizing the seeds by using 
sterile water containing naphthyl 
acetic acid; sterilizing the seeds in the 
greenhouse, which can be realized by fumigating every cubic meter of seeds by using 4 g 
mushroom protector, fumigating the seeds for one time before 
sowing, and fumigating the seeds every half a month in the future; scattering, which can be realized by after the seeds are scattered and before the seedlings are transplanted, controlling temperature in the greenhouse, 
water content of the seedling bed and 
air humidity, treating the seeds by weak lights within the first month of the scattering, and gradually enhancing illumination after 
budding; managing water, fertilizers and diseases of the seedlings; and 
transplanting the seedlings. The method for directly seedling the dendrobe seedlings by using the plastic greenhouse, provided by the invention has the advantages that as the dendrobe are transplanted after directly becoming to the seedlings, the seedling breeding cost is effectively reduced, the seedling rate of the seeds is more than 90 percent, and the 
transplanting survival rate of the seedlings is 100 percent.