The invention provides a subarray-division-based FDA distance-angle decoupling wave beam formation method. With the method, a problem that distance-angle decoupling wave beam formation can not be realized by using the exiting frequency classification array can be solved. The provided method comprises: step one, a frequency classification array is divided into a plurality of sub arrays and frequency stepping values are introduced into the sub arrays respectively, so that a transmitting signal frequency is designed; step three, a subarray-division-based steering vector of a frequency classification array is constructed; step four, a subarray-division-based transmission weight vector of the frequency classification array is constructed; and step five, according to the guiding vector and the transmission weight vector of the array, a distance-angle two-dimensional wave beam formation directional diagram is obtained. According to the invention, the direction of the wave beam main lobe is changed and distance-angle two-dimensional decoupling wave beam formation is realized, so that wave beam control flexibility is substantially improved. The method can be applied to distance-angle domain combined detection of a target and the interference related to a distance can be suppressed.