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Focusing on the deficiencies of previous water quality monitoring and controlling systems such as the blind area of data acquisition in water quality sensor, a functional conventional processor and communication module that can't meet the need of a large amount of data processing and transmission, an online water quality monitoring system based on Internet-of-Things(IOT) technology is designed. The system consists of data acquisition node, data gathering node and monitoring center computer. This system uses INA118 amplifier as the core of weak signal conditioning circuit, and STM32 microprocessor to do real-time data acquisition and processing, and can upload water quality data to the cloud platform of IOT combined with IOT technologies of telecommunication such as low speed over short distances of ZigBee and high speed over long distances of CDMA200. Monitoring center computer can display real-time data by downloading from the IOT cloud. The measurement data of the comparative experiments shows that the whole system has a good real-time quality with high measurement accuracy. The average relative error of temperature, PH value and conductivity is about 0.64%, 1.33% and 2.33% respectively, and this result shows that the system can meet the requirements of water quality monitoring well.