Anionic surfactant on-line analyzer

The invention discloses an anionic surfactant on-line analyzer, which comprises a pipeline joint, a control module, and a sample introduction module, an extraction detection module, a washing module, a liquid discharge module and a reversing valve assembly which are in signal connection with the control module; the sample introduction module comprises a main pipeline and 12 external interfaces which can be in control conduction with the main pipeline; a pipeline of the main pipeline is connected in series with a dual-optocoupler quantitative assembly and a first quantitative pump; the extraction detection module comprises a first cup body, an air pump, a one-way valve and a first stirring device, an absorbance detection device is arranged at the bottom of the first cup body, the washing module comprises a second cup body and a second stirring device, and a second metering pump is connected to a pipeline of the second cup body in series. The control module can realize full automation of the steps of sample int