Bridge overload active early warning method and system

The invention relates to a bridge overload active early warning method and system, belongs to the technical field of bridge monitoring, and solves the problem that in the prior art, safe passage assessment cannot be carried out by dynamically simulating the most unfavorable live load arrangement. Comprising the steps of collecting vehicle load information in real time, identifying an overloaded vehicle and a type thereof, and obtaining a to-be-early-warned section and bridge information included in the section; acquiring load information of a to-be-simulated vehicle according to the type of the overloaded vehicle, and acquiring axle coordinate information of the to-be-simulated vehicle by simulating the most unfavorable live load arrangement to form vehicle load data; respectively transmitting vehicle load data into the finite element model of the bridge, acquiring vertical scale values of main beam internal force influence surfaces corresponding to axles of a to-be-simulated vehicle, respectively calculating