The invention discloses a three-dimensional aging fracturing model construction method giving consideration to a flexural contribution effect. The method comprises the construction processes of a rock mass microscopic grain three-dimensional parallel bond stress mode giving consideration to the flexural contribution effect, a rock mass microscopic grain three-dimensional parallel bond aging degradation attenuation exponential type mode giving consideration to a flexural coupling effect, a mohr-coulomb microscopic grain three-dimensional parallel bond aging fracturing code with tensile cut-off limit giving consideration to the flexural coupling effect and a microscopic grain three-dimensional linear contact model giving consideration to a dampening effect. The three-dimensional aging fracturing model construction method giving consideration to the flexural contribution effect is applicable to the rock mass of which the relationship between the stress and crack propagation velocity accords with an exponential type under the circumstance of three-dimensional stress space, and can provide technical support for prediction, evaluation and optimization design of long-term stability of surrounding rocks of the deep rock mass project under the circumstance of the three-dimensional stress.