The invention discloses a digital integrated photonic device simulation method and system, and belongs to the technical field of integrated photonic devices. The method comprises the following steps:arranging units with the same shape and size and variable relative dielectric constants in a to-be-optimized region of the device; acquiring a quality factor under forward simulation and a forward electric field E of each unit, acquiring an accompanying electric field EA of each unit under accompanying simulation, and iteratively updating the relative dielectric constant of each unit until the quality factor is converged; acquiring a forward electric field of each unit under the forward simulation, acquiring an accompanying electric field of each unit under the accompanying simulation, and performing linear bias on the relative dielectric constants of the units until the relative dielectric constants of all the units tend to be binarized; through the ternary processing, enabling all unitsin the to-be-optimized area to be made of a target material. According to the method, the calculated amount in the device simulation process is greatly reduced, the simulation efficiency is high, andthe device performance is effectively improved.