The invention discloses a selenium-rich tea-oil tree planting method. The selenium-rich tea-oil tree planting method comprises the steps that land improvement is performed, wherein sandy land with the slope smaller than or equal to 25 degrees is selected as land to be used, uniform turnover and ploughing are performed, then a land improver is applied based on 50-80 kg/mu, and natural keeping is performed for 2-3 days; the land improver is applied again based on 30-60 kg/mu, uniform turnover and ploughing are performed, and natural keeping is performed for 10-20 days; then, selenium-rich farmyard manure is applied based on 1500-2200 kg/mu, the land is raked to be fine, and improved land is obtained, wherein the land improver is prepared from gypsum, cinnamon soil, phosphogypsum, ferrous sulfate, sulfur powder, weathered coal, water, zinc sulfate, chitin, carboxymethyl chitosan, heparin, sodium alginate, chitosan, sulfate, phosphate and acetic acid. The selenium-rich tea-oil tree planting method has the advantages that planting land can be improved to provide acid soil conditions suitable for growth of tea-oil trees, meanwhile the selenium-rich farmyard manure is applied to soil for improvement of a soil nutrition structure of the planting land, so that the tea-oil trees grow rapidly, and nutritional ingredients are comprehensive and contain a selenium element required by a human body.