Online detection method and device for chloride ion concentration for salt spray test box

The invention discloses a chloride ion concentration on-line detection method and device for a salt spray test box, and the method comprises the steps: S1, preparing NaCl solutions with different concentrations, and carrying out gasification to obtain a sample gas; s2, placing a sample gas to be detected in a sample gas cell; s3, performing Raman spectrum detection on the to-be-detected sample gas placed in the sample gas cell; s4, a Raman scattering signal is obtained through detection of a detector, and a voltage signal is output; s5, processing the voltage signal by using a microcontroller to obtain a relationship between the chloride ion concentration and the output voltage signal of the detector; and S6, after salt mist in the salt mist test box is atomized, conveying the salt mist into the sample gas tank, carrying out Raman spectrum detection, obtaining an output voltage signal by adopting the step S4, and carrying out automatic calibration conversion according to the relationship between the chloride