The invention provides a method of cultivating root mustard, comprising the steps of 1) preparing a land, to be specific, 
tilling a fertile land, digging the fertile soil to obtain 20-30 cm deep holes, backfilling with sandy soil, and setting up a 
greenhouse over the tilled land; 2) applying 
fertilizer, to be specific, spraying 
farmyard manure evenly to the surface of the backfilled sandy soil, covering the surface of the sandy soil fully with 
plastic film for the purpose of covering, and removing the 
plastic film 4-7 days later; 3) scattering seeds, to be specific, setting planting holes evenly in the surface of the sandy soil, and adding root mustard seeds into the planting holes; 4) applying 
fertilizer again, to be specific, adding 3-5 cm deep 
plant ash to the planting holes with seeds scattered in for the purpose of covering, and irrigating and applying 
fertilizer to the planting holes; 5) harvesting, to be specific, when sprouts grow to about 10-15 cm, with flat, fat seed leaves and red hypocotyledonary axis, reaping for sales. By using the method of the application, the ability of roots of root mustard to absorb nutrients is improved greatly, and the nutritional value of harvested root mustard is improved.