The sulphide water quality analyzer is an on-line monitoring instrument for the sulphide index of surface water and effluent. The instrument is based on national standard or industry standard, with the characteristics of simple operation, high degree of automation, easy maintenance and low cost of consumables. The instrument is equipped with RS485/RS232 interface, supports MODBUS protocol, and can fully grasp its operating status and data through remote communication, and can also remotely control it. Realize remote analysis, remote calibration, remote cleaning and other advanced functions. In addition, the instrument has a dilution function, which can also meet the requirements of its application for high concentration samples. After a long time of feedback verification, its analysis accuracy and other indicators are better than the relevant national standards. This product is suitable for: surface water, domestic sewage, industrial wastewater, etc.