Kale is an aquatic plant that is classified as a vegetable that is often consumed by people and rich in various nutrients that humans need. Water kale will cause health problems if it contains heavy metals. This study aims to determine the effect of variations in the concentration of kaffir lime solution on soaking kale to reduce levels of Cd and Hg metals in water kale. The research method used wet destruction and dry destruction, and then the sample was analyzed using an atomic absorption spectrophotometer. The results showed that the Hg metal content was 0.0068 ± 0.0082 mg/kg, and Cd was 0.0029 ± 0.0028 mg/kg. According to SNI 7378: 2009, the maximum limit of Hg contamination is 0.03 mg/kg and Cd in vegetables is 0.2 mg/kg. After soaking for 30 minutes with a kaffir limesolution, a concentration of 5, 10, 15, 20, and 25%, the Cd and Hg metals decreased. At a concentration of 25%, it shows a decrease in Cd and Hg metals of 0.0016 ± 0.0004 mg/kg (42.86%) and 0.0079 ± 0.0016 mg/kg by 32.00%.