The invention discloses an LOD model real-time generation method based on side folding. The method includes the following steps: calculating the distance between a view point and a three-dimensional device model according to the position of the view point and the position of the three-dimensional device model, determining the simplifying degree of the three-dimensional device model according to the distance between the view point and the three-dimensional device model and conducting real-time simplification on the three-dimensional device model according to the simplifying degree of the three-dimensional device model and real-time simplifying operation based on peak simplified weight. By simplifying the three-dimensional device model in real time, a similar three-dimensional device model with required resolution can be obtained in real time, resolution change continuity is ensured, and vision information of the three-dimensional device model is well reserved by introduction of a simplified weight value.