Aiming at the highly sensitive and stable detection of trace amounts of Cd²⁺ in water, an experimental study based on Al sheet electrodeposition enrichment (ED) combined with laser-induced breakdown spectroscopy (LIBS) to detect Cd in water analysis method (ED-LIBS) is carried out. The effects of enrichment time, enrichment voltage, concentration of conductive solute KCl, and sandpaper polishing on the electrode surface, on Cd element enrichment are analyzed. The result shows that the enrichment stability of Cd element is improved after the Al flakes for electrical-deposition being polished by sandpaper. The optimized enrichment voltage, enrichment time and concentration of KCl are -2.4 V, 1200 s and 2 g/L, respectively. By using the proposed method, the detection limit and relative standard deviation of Cd element are 0.0021 mg/L and 3.30%, respectively, which meets the detection requirement of "Sanitary Standards for Drinking Water" and provides an optional method for the highly sensitive and stable analysis of trace Cd elements in water.