The invention discloses a water quality stabilization device and technology for circulating cooling water. According to the technology, with DSA electrode electrochemical water quality stabilization as the core, the technological process of electrolysis, descaling, filtration and scale concentration is optimized to achieve water quality stabilization control over the circulating cooling water. In the electrochemical action process, raw water enters an electrolysis zone through a water distribution system for a softening reaction, Cl2 is generated at the same time to achieve effective control over the system biophase, a subsequent fiber bundle filtering system effectively shields calcium carbonate crystal nuclei and biological slime generated by the electrochemical action, and when a cathode plate scales and the electrochemical process is affected, an intermediate electrode is reversely connected to descale the cathode plate. The intermediate electrode is introduced into the technology, and thus the cathode plate is effectively descaled without affecting the service life of an anode; multiple water quality stabilization units for raw water distribution, an electrochemical reaction, biophase control, suspended solid filtration and the like are integrated, and thus the integration level of main equipment is increased; meanwhile, solid-liquid separation and sludge concentration are achieved in the main equipment, it is unnecessary to additionally arrange other equipment or devices, the mechanization degree is high, the application range is wide, the capital construction investment and the operation cost are low, the occupied area is small, and operation is easy.