The invention discloses a water environment pre-warning and comprehensive management platform, and belongs to the technical field of water environment monitoring. The platform mainly comprises an information management module, a water environment analysis and evaluation module, a water environment pre-warning and forecasting module, a water environment comprehensive management module, a GIS systemmodule and a data monitoring module. According to the platform, information of each partition basin and information of surrounding pollution sources of each monitoring point are established, so thatpertinence for the key monitoring and precaution for the key areas and key elements with potential safety hazards is strengthened; and analysis, assessment and trend analysis are carried out on waterquality of the monitoring points, and a water quality pre-warning and forecasting model is constructed, so that monitors are helped to timely recognize water environment pollution areas and pollutionlevels, and deciders are helped to carry out correct judgement, timely processing and effective measure implementation when accidents occur, thereby strengthening the comprehensive management for water environment of offshore areas.