The invention provides an online risk management system for building construction quality and safety, which relates to the technical field of risk management of construction engineering, and includes a comprehensive management subsystem and a single project management subsystem. The comprehensive management subsystem includes project risk status, risk monitoring and early warning, work Five functional modules, including reminder, instruction issuing, and emergency drill, are used to browse the relevant information of all projects undertaken by the company, send instructions to the project department, and check the daily work of the project department; the single project management subsystem includes engineering information, risk identification, risk Nine functional modules, including assessment, risk tracking, early warning and emergency response, document management, work reminder, command reply, and video surveillance, are used for risk identification, assessment, tracking, early warning and emergency response through project overview information, and remote monitoring of project sites. This system integrates online risk assessment system, remote monitoring system and risk management information platform to realize real-time and whole-process management of risks in large-scale construction projects.