Most of the current direct positioning methods are mainly for narrow-band signals. A wide/narrow band signal Direct Position Determination(DPD) method based on distributed Unmanned Aerial Vehicle(UAV) platform is proposed. Firstly, the received data of multi-UAV platforms are synthesized in frequency domain, and a cost function directly related to the source location is established based on multiple frequency points. Secondly, the monitoring area is gridded to determine the location of the target source. Finally, the multi-UAV movement monitoring is carried out, and the monitoring area is continuously reduced. The final positioning result is obtained by clustering analysis of multiple positioning results. Simulation results show that the localization performance of this method is obviously better than that of traditional localization methods. The processing results of the measured data show that the proposed method has better positioning performance than the improved Time Difference of Arrival(TDOA) positioning method.