The invention discloses a multi-task management system for nuclear power plant security-level equipment software, and the system comprises a time management unit used for meeting various application platforms, and measuring the operation time of a function module in the nuclear power plant safety-level equipment software; a task management unit provided with a task creation interface so that taskscan be added to nuclear power plant security-level equipment software through the task creation interface; a task scheduling unit used for scheduling the tasks in the nuclear power plant security-level equipment software and sequentially executing the tasks according to the set priorities; and an exception handling unit is used for obtaining the exception condition of the task in the nuclear power plant security-level equipment software, and providing an exception handling mode for a user to select based on the exception condition of the tasks, so that the technical effects of efficient management of multiple tasks in the nuclear power plant security-level equipment software, relatively low workload and relatively high safety are realized.