The invention discloses a method for realizing broadband data transmission through a discrete narrow band. The method comprises the following steps of: (1) modeling a wireless frequency range special for a power system; (2) determining frequency spectrum information according to a frequency spectrum sensing technology and finding out a wireless resource idle frequency range; and (3) performing carrier aggregation on the found idle frequency range. According to the method, the discrete narrow band condition of the conventional communication frequency band of the power is changed through the frequency spectrum sensing technology, the frequency point resource is balanced, an idle channel is subjected to carrier aggregation, and the frequency resource is effectively utilized; and the requirements of services such as important operation occasions such as power wireless communication power utilization information acquisition, power video/image monitoring power construction sites, power transmission line key sections, emergency command and accident disposal sites and substations are met.