The invention discloses a divide-and-conquer strategy-based quick searching method of a transmission network line convergence area. The method includes the following steps: 1) establishing two-dimensional plane coordinates according to all line tower locations in a transmission network; 2) selecting a line L1 and a line L2 from the transmission network, and forming a point set S by all tower coordinates of the line L1 and the line L2; 3) comparing abscissa value sizes of all points in the point set S, and carrying out arrangement according to an order from a low to a high; 4) decomposing the point set S to form a decomposition tree; 5) calculating a distance delta of two points in the decomposition tree, and placing tower coordinates, of which the distance delta is less than specified spacing d, into a result point set S'; and 6) repeating the step 2-the step 5 until comparison of every two lines in the transmission network is completed. According to the method of adopting a divide-and-conquer strategy to automatically and quickly find out points of which tower spacing distances between the different lines are less than a specified value of the invention, searching time is greatlyreduced, and searching efficiency is improved.