Three-dimensional model multi-resolution finite element analysis method, system and equipment based on octree algorithm and medium

The invention provides a three-dimensional model multi-resolution finite element analysis method, system and device based on an octree algorithm and a medium. The method comprises the steps that an STL format file of a three-dimensional model is input; the method comprises the following steps: determining a maximum cubic bounding box of a model in a three-dimensional space as a root node, splitting in X, Y and Z dimensions, dividing into a plurality of sub-nodes, and dividing into three types according to the spatial position relationship between each sub-node and the model: all located inside the model, intersecting with the model and all located outside the model; according to the spatial position relationship between the child nodes and the model, determining whether the child nodes continue to be subdivided or not; carrying out filtering and balance checking on the subdivided grids; the problem that units with different sizes are discontinuous is solved through a high-order Serendiality unit, so that subs