Water sample alkalinity measuring device and method based on ORP electrode

The invention relates to a water sample alkalinity measuring device and method based on an ORP electrode. The device comprises a controller, a measuring part and a sample adding part; the measuring part comprises a water sample container and the ORP electrode; the water sample container is used for placing a water sample to be measured; the ORP electrode is electrically connected with the controller; the ORP electrode is arranged in the water sample container; the sample adding part comprises a metering pump; the metering pump is connected with a standard hydrochloric acid solution container and the water sample container through pipelines; and the metering pump is electrically connected with the controller. The ORP electrode is adopted, the terminal point of titration is recognized through the change of ORP oxidation reduction potential in the titration process, the mode of manually judging a color change terminal point in titration is replaced, the measurement accuracy and consistency are good, and phenolph