The invention discloses a networking method and a networking system for power line carrier and wireless converged communication. The networking method comprises the steps of: firstly, searching lower-level nodes step by step from a central node until all the terminal nodes complete present-level network layering, and recording signal-to-noise ratio information of a power line carrier channel between each node and the upper-level node thereof and signal-to-noise ratio information of a wireless channel between the node and the upper-level node thereof by means of the node in the searching process; selecting a cluster head node of each level according to the signal-to-noise ratio information and connectivity information of the nodes; creating a cluster; and selecting an inter-cluster relay node by means of the cluster head node of each level according to the signal-to-noise ratio information between the cluster head node and a cluster head node of an upper level, and completing the networking of the clusters. The networking method and the networking system for power line carrier and wireless converged communication can realize quick and reliable networking of a power line carrier andwireless converged communication network.