In order to analyze the impact of rock plasticity on crack closure during production, an elastic-plastic crack closure model was established using the Drucker Prager yield criterion based on the Herz contact model. The effects of different in-situ stresses and rock plasticity parameters on the crack closure behavior were analyzed. The results indicate that the elastic modulus, hardening parameters, and cohesion are key factors affecting the plastic crack closure. The greater the cohesion, the greater the initial yield stress. The larger the ratio of hardening parameters to the elastic modulus is the greater the subsequent yield stress, and the weaker the plastic effect of crack closure. In addition, the in-situ stress also has a significant impact on crack closure. The higher the normal stress in the normal direction of the crack surface, the higher the plastic effect coefficient of crack closure.