The invention discloses a multiple-reflection flame atomizer. The multiple-reflection flame atomizer comprises a multiple-reflection absorbing area and an external light path. The multiple-reflection flame atomizer disclosed by the invention has the advantages that the effect of repeatedly penetrating flame is achieved by controlling measuring beams; by collimation of the external light path, the structure of a monochromator is simplified, the limitation of an incident diaphragm is eliminated and the luminous flux is increased; under the premise of not changing the size and the state of the flame, the effective optical path is increased and the detection sensitivity of an instrument is improved.