The invention discloses a cost-saving and effectiveness-increasing tea garden nursery soil preparation method. The method comprises the steps that nursery field plowing and fertilizing are carried out, soil is ploughed through a rotary cultivator, biogas broth is sprayed through a biogas residue liquid pumping drainage conveyor, and manual plowing and fertilizing are replaced; furrowing and nursery bed are prepared, after furrows are formed, a home-made rake(with the length of 2.4 m, the width of 45 cm and the depth of iron teeth of 7 cm) is used for breaking and raking soil of the nursery bed, a home-made cement roller with the length of 2.1 m, the width of 2.0 m, the diameter of 11 cm and the weight of 50 kg is used for rolling to and fro to compact nursery soil; a shed is established for shading, short sprout cuttage is carried out, and the cuttage density is 400-500 thousand plants/667 m<2>. The labor cost of the method is only 20.34%-23.18% of that of a traditional method, the labor intensity is improved, high density cuttage can be carried out on the nursery field prepared through the method, a specific nursery management technology is adopted, qualified tea seedling yield reaches 200-300 thousand/667 m<2>, while the tea seedling yield in the prior art is only 120-150 thousand/667 m<2>, and the method has the advantages of saving labor and being efficient.