The contents of lead and cadmium in hot-dip-galvanized aluminum-magnesium alloy coating are important indexes to evaluate the quality of products. At present, there are no relevant standard methods for the analysis of lead and cadmium contents in zinc-aluminum-magnesium coating. The determination method of lead and cadmium in hot-dip-galvanized aluminum-magnesium coating by flame atomic absorption spectrometry (FAAS) was established in experiments. The alloy coating was dissolved with 30% (V/V) hydrochloric acid. Meanwhile, hexamethylenetetramine was added as corrosion inhibitor to protect the matrix. The alloy coating could be fully dissolved while the matrix was not corroded. Under the optimized working condition of instrument, the matrix matching method was used to eliminate the matrix effect of zinc on the determination of testing elements. The content of lead and cadmium was determined by FAAS at wavelength of 217.0nm and 228.8nm, respectively. The linear correlation coefficients of calibration curves for lead and cadmium were both greater than 0.9995. The limit of detection was 0.0020mg/L for lead and 0.0010mg/L for cadmium, respectively. The contents of lead and cadmium in hot-dip-galvanized aluminum-magnesium alloy coating were determined according to the experimental method. The relative standard deviations (RSD, n=10) of determination results were between 2.4% and 6.3%. The spiked recoveries were between 97% and 103%.