The invention discloses a smashed-state coarse aggregate discrete element method. The smashed-state coarse aggregate discrete element method comprises the following steps: (1) performing initial screening of coarse aggregate particles; (2) performing CT scanning; (3) performing PFC2D modeling of discrete element software; (4) calibrating parameters of a single-particle-size coarse aggregate particle contact rigidity model; (5) performing statistics to obtain the smashing amount of single-particle-size coarse aggregate particle under penetration resistance; (6) performing statistics to obtain the smashing amount of different grades of coarse aggregate particles under penetration resistance; and (7) correcting parallel connection model parameters based on the coarse aggregate particle smashing amount. Through adoption of the smashed-state coarse aggregate discrete element method, the problem that virtual coarse aggregate particles cannot be smashed in a road engineering discrete elementsimulation process is solved. Micro model parameters of particles of different particle sizes are determined by a Cluster model in discrete element software in conjunction with statistics of the smashing amount in an indoor penetration resistance test in order to simulate a smashing process of a particle material under the action of external resistance, and the virtual coarse aggregate particle shape rebuilding accuracy is ensured by image scanning.