The invention discloses an apparatus and method for measuring a two-dimensional gas-phase Na concentration field and a temperature field of a boiler. The apparatus comprises a mirror bar, a camera protection shell and a color
CCD camera, wherein a first end of the mirror bar is provided with a cooling air outlet, and a second end of the mirror bar is provided with a cooling air inlet; a high-temperature-resistant lens, three
optical imaging lenses and a narrow-waveband three-channel
optical filter are successively arranged from the first end to the second end of the mirror bar; the camera protection shell is connected with the second end of the mirror bar; the color
CCD camera is arranged in the camera protection shell, the color
CCD camera is provided with a power supply interface for powering the color CCD camera and a
network interface for transmitting data and a
control signal, when the first end of the mirror bar enters the boiler, the
radiation light of
flame in the boiler successively passes by the high-temperature-resistant lens, the three
optical imaging lenses and the narrow-waveband three-channel
optical filter to enter a sensor of the color CCD camera so as to generatethree single-color
flame images with different wavelengths.