NOVELTY - Improvement of selenium-enriched vegetable cultivated farmland involves using dried paddy farmland, tilling soil, forming ridge, filling with upland soil, peat soil, rich loam soil, and fired loam soil, and mixing with manure, lime, livestock manure, fertilizer, and compost; planting and irrigating with Osmunda japonica seedlings; irrigating on second year, spraying buds, sowing milk vetch, irrigating, and applying rich soil and fertilizer; and fertilizing Osmunda japonica on third year, picking, sowing milk vetch, harvesting mature milk vetch, and applying fertilizer.    USE - Method for improving selenium-enriched vegetable cultivated farmland (claimed).    ADVANTAGE - The method increases yield and quality of milk vetch. The milk vetch has high selenium content.    DETAILED DESCRIPTION - Improvement of selenium-enriched vegetable cultivated farmland comprises: (A) using dried paddy farmland, tilling soil for 2-3 times, forming ridge, filling with upland soil, peat soil, rich loam soil, and fired loam soil at mass ratio of 1:1:0.4:0.2-1.2:1:0.8:0.4, where fired loam soil comprises straw and tree branches and leaves at ratio of 1:2-3, and mixing with 4 kg manure, 0.8 kg lime, 4 kg livestock manure, 0.5 kg fertilizer, and 5-1 g compost; (B) planting and irrigating artificial breeding/wild Osmunda japonica seedlings, where height of the water ditches is 18 cm; (C) irrigating on the start of second year, spraying buds for 3-5 minutes, sowing milk vetch, irrigating, and applying 120-150 kg rich soil and fertilizer; and (D) irrigating on third year, fertilizing Osmunda japonica, spraying for 3-5 minutes, picking Osmunda japonica for 3-4 times, sowing milk vetch, harvesting mature milk vetch, blanketing leaves on ground, stopping irrigation, and applying fertilizer, where livestock manure is prepared by taking sorghum, wheat, and soybean at mass ratio of 6:3:1, crushing, mixing, adding 1:5 ratio of yeast and fermentation substrate, mixing, adding water, fermenting at 28 degrees C for 70 days, and mixing with livestock and poultry manure.