The invention provides a soaking solution capable of modifying and toughening juncus effusus. The soaking solution comprises the following raw components in parts by weight: 40-48 parts of edible vinegar with a concentration of 5.3%, 1-2 parts of rhizoma kaempferiae, 0.4-0.8 part of sodium chloride, 0.1-0.5 part of alpha-olefin sulfonate, 0.1-0.5 part of isopropyl myristate, 10-15.6 parts of morning glory root, 3.4-5.2 parts of illicium verum, 10-15.6 parts of bitter orange blossom, 0.3-0.6 part of sodium dodecyl benzene sulfonate, 4-7 parts of an aloe extract; 5-10 parts of mugwort, 2-4 parts of hydroxyl fluorosilicone oil and 12-17 parts of a toughening preparation. The soaking solution provided by the invention is free from toxic stimulus chemicals, and thus no ingredients being harmful to the human body remain after the soaking; the soaked juncus effusus is still sufficient in toughness, and very good in anti-bending capability and anti-torsion capability; meanwhile, the specific herbal fragrance of the juncus effusus is prevented from being eliminated in the soaking process; and after the soaked juncus effusus is placed in an oxygen-rich and wet environment for 5 years, the color and luster is still unchanged.