The invention discloses a semi-submersible type base platform stress safety early warning monitoring system. The system mainly comprises sensors, wires and a data acquisition and monitoring system, wherein the sensors are arranged on a part to be tested, and the stress value of the part to be tested is tested in real time; and the data acquisition and monitoring system collects data collected by all the sensors in real time and analyzes and displays the data. According to the safety pre-warning monitoring method, the stress change caused by longitudinal bending of all parts of a ship body under the water flow erosion condition can be monitored in real time, and the safety of the platform is pre-warned by analyzing the stress change. The scheme provided by the invention can be used for monitoring and early warning the stress safety of the semi-submersible type base platform in real time, so that constructors can timely know the safety states of the whole semi-submersible type base platform, effective measures can be taken in time, and the structure of the platform is prevented from being damaged.