The invention discloses a D2D routing selection method of a 4G system based on a terminal level and a node number. The method comprises the following steps: step 1, when two nodes need to communicate,calculating an average value of terminal levels of all terminals on each path between the two nodes and equivalent terminal levels; step 2, calculating a characteristic value of each path, and selecting the path with the smallest characteristic value as a routing path between the two nodes; and step 3, after the time T, calculating the characteristic value of each path again, and selecting the path with the smallest characteristic value as the routing path between the two nodes.