The invention provides a method for preparing purple sand slime containing tourmaline iron sand. Ore and raw tourmaline scattered in a soft clay ore bed are artificially selected, purple sand ore is stacked in the open air in winter and summer for natural weathering, the weathered raw ore is aired, dried, ground by means of a hard stone mill and smashed into 60-mesh fine powder, 80-mesh fine powder and 120-mesh fine powder, and after the tourmaline ore is smashed and ground and ore powder is screened out by a 140-mesh sieve, water is added, the materials are mixed, evenly stirred and sealed for ageing; vacuum pugging, clay strip pressing, sealing and ageing are repeated for 3-5 times, and the purple sand slime containing the tourmaline iron sand is prepared. The slime prepared through the method is original, pure, free of chemical raw materials and artificial pigment and not likely to crack when purple sand ceramic products are fired, and the manufactured purple sand ceramic products are natural, environmentally friendly, good in quality, natural in texture, fine and smooth in hand feeling, good in light transparency and water color and good in color generation. Meanwhile, the purple sand slime has the effects of improving water quality and promoting blood microcirculation.