A melt and concrete interaction analysis method based on a particle method mainly comprises the following steps that 1, conducting particle modeling, and setting initial arrangement and parameters ofparticles; 2, establishing and dividing a background grid according to nodes, and retrieving neighbor particles; 3, calculating the enthalpy value, temperature and phase state of the particles; 4, calculating eutectic and chemical reactions, updating particle matter components and physical property parameters, meanwhile, calculating chemical heat and updating the particle enthalpy value, temperature and phase state; 6, calculating gas motion and updating the particle type, speed and position; 7, displaying and calculating a viscosity item, a surface tension item and a gravity item in the momentum equation, and estimating the particle speed and position; 8, displaying and calculating a pressure item in the momentum equation by using the estimated particle position, and correcting the particle speed and position; 9, outputting a calculation result. All phenomena of interaction between the melt and the concrete are considered. Based on a particle method, the free liquid level can be accurately captured and modeling and accurate phase change processing are facilitated and large-scale calculation is facilitated by adopting the display pressure model.