The invention discloses a three-dimensional simulation modeling method and device for a road network, a terminal and a storage medium. The method comprises the steps of obtaining a scene resource library; obtaining a digital road network file; converting the description file of the lane information into a lane frame model based on a triangular gridding algorithm, and attaching the mapping data ofthe lane in the scene resource library to the lane frame model according to a preset rule to generate a road lane three-dimensional model file; fitting the three-dimensional model data of the road traffic signal sign in the scene resource library to a traffic signal sign framework diagram generated by the road traffic signal sign information description file to generate a three-dimensional model file of the road traffic signal sign; combining the generated information of the traffic signal sign with position information corresponding to the information of the traffic signal sign in a road lanethree-dimensional model to generate a road network three-dimensional model file; and verifying the three-dimensional model file of the road network to obtain a three-dimensional simulation model fileof the road network.