Abstract: An atomic absorption spectrometer, including: a light source combination; a detection device; a flame atomization device; a hydride generation device; a graphite furnace atomization device; and an adjustment mechanism. The flame atomization device includes a flame atomizer. The hydride generation device includes a hydride atomizer. The graphite furnace atomization device includes a graphite furnace atomizer. An axis of the flame atomizer, an axis of the hydride atomizer, and an axis of the graphite furnace atomizer are adjusted by the adjustment mechanism to coincide with an optical axis of the light source combination.