When the added amount of modified slitbite is 0.7 g/L, the Pb2+, Cu2+ and Cd2+ adsorption effect is the most ideal, with the adsorption rate exceeding 90%. Adsorption levels of the three metals were 93.89%, 91.43%, and 92.95%, respectively. At ideal levels, heavy metal ions may be effectively removed from polluted groundwater.