Secure route construction method based on SDN (Software Defined Network) and path security degree in element universe

The invention discloses a secure routing construction method based on SDN and path security degree in a meta-universe. The method comprises the following steps: 1) establishing a man-machine-object fusion heterogeneous system in a physical world; 2) obtaining a twinborn body of the man-machine-object fusion heterogeneous system in the physical world in the virtual world of the element universe through a digital twinborn technology; (3) nodes connected with the network in the man-machine-object fusion heterogeneous system are connected to infrastructure layer equipment of the software-defined network, and a framework of the man-machine-object fusion heterogeneous system of the software-defined network is constructed; 4) constructing a topological structure of the virtual man-machine-object fusion heterogeneous system by using a software defined network controller; 5) deploying an abnormal node detection algorithm at the software defined network controller, and carrying out abnormal node detection on the networ