The invention discloses a device and a method for continuously analyzing pH value, phenolphthalein end-point alkalinity, total alkalinity and chloridion concentration. The method comprises the following steps: a. using a standard acid liquid adding unit to perform alkalinity titration to a sample to be detected, and sequentially performing the alkalinity titration: phenolphthalein end-point alkalinity titration and total alkalinity titration, and respectively reading corresponding liquid volume values for titration in the titration end-point, calculating the phenolphthalein end-point alkalinity and the total alkalinity, wherein the initial pH value acquired by a pH electrode is the pH value of the sample to be detected; and b. performing chloridion potentiometric titration to the sample to be detected after the total alkalinity is completed, reading the liquid volume value for the titration when in the titration end-point and calculating the chloridion concentration. The device for continuously analyzing the pH value, the phenolphthalein end-point alkalinity, the total alkalinity and the chloridion concentration comprises a potentiometric titrimeter main machine with double electrode interfaces, the pH electrode (1), the standard acid liquid adding unit (2), a silver electrode (3), a silver nitrate standard liquid adding unit (4) and a control system. According to the invention, the detection time is greatly shortened, the working efficiency of the device is improved, and the sample consumption and the standard acid liquid consumption are saved.