The invention provides a Water body pollutant and hydrology monitoring early-warning/alarming method and system, relates to the fields of water body pollutant and hydrology monitoring alarm, and aims at solving the problems that a present monitoring technology is high in labor cost and water treatment is slow in response. A data collection module sends collected water body pollutant data and hydrology data to a data processing platform, the data processing platform determines whether to raise early warning or alarm according to the water body pollutant data and hydrology data, if YES, early warning or alarm suggestion information is sent to a manager whose needs to be notified in the form of a short message, and if NO, water body pollutant data and hydrology data of a next sampling period are waited form. The method and system are suitable for water pollutant and hydrology monitoring.