The invention relates to a tea seedling mulching method. Before or after being planted, tea seedlings are mulched with a black dissoluble mulching film. Before being planted, the tea seedlings are mulched with the mulching film according to the following steps of ridge arranging, mulching film mulching and tea seedling planting, and after being planted, the tea seedlings are mulched with the mulching film according to the following steps of ridge arranging, tea seedling planting, mulching film mulching, hole breaking and watering. The distance between every two ridges is 1.8m. According to the method, the tea seedlings are mulched with the black dissoluble mulching film, the black film is good in reflection effect, and thus heat and moisture preservation and damp resistance are achieved; the roots are mulched with the mulching film, the air permeability is good, and thus the tea seedlings will not be smothered to death; the black dissoluble is long in service life, weeding is not needed, wind effect is small, the survival rate is high, and growth of weeds can be restrained.