The embodiment of the invention provides a Method and device for selecting AN initial source node in mobile opportunity network traffic offloading and electronic equipment. The method comprises the steps: obtaining a link change relation among all nodes in the mobile opportunity network in a preset time period, and generating a weighted reachable graph according to the link change relation; dynamically allocating the resource value of each node according to a preset resource value allocation strategy based on the weighted reachability graph; and when the resource value of each node reaches a stable state, selecting an initial source node according to the size relationship of the resource value of each node. By applying the embodiment of the invention, in the process of selecting the initial source node, the link change relationship of the mobile opportunity network is considered, so that even if the topological structure of the mobile opportunity network is greatly changed, the node with strong transmission capability in the mobile opportunity network can be more effectively identified as the initial source node, and the data transmission efficiency is improved.