Simulation testing method and system based on nuclear power plant

The invention discloses a simulation testing method based on a nuclear power plant. The method comprises the steps: a simulation testing system acquires first time operating data and second time operating data of a nuclear power plant system, wherein the second time operating data is real-time operating data; the obtained first time operating data and the obtained second time operating data are inputted into a preset simulation model, and simulation testing is carried out; result data of the simulation testing is compared with the real-time operating data; and if a difference value between the result data and the real-time operating data is greater than a preset error value, the simulation test system adjusts the preset simulation model. The non real-time operating data and the real-time operating data of the nuclear power plant system are inputted into the simulation model for simulation testing, so that not only is the problem that the nuclear power plant system cannot realize effective simulation risk early warning before accidents during operation of the nuclear power plant solved, but also the accurate simulation testing can be realized. In addition, the invention also discloses the simulation testing system based on the nuclear power plant.