With the rapid advancement of modern military technology, radar systems are widely used on battlefields. However, due to constraints like airspace and terrain, testing their performance and reliability in real signal environments is challenging. To address this, a UAV-mounted multi-mode broadband radar waveform simulation electronic target based on the ZYNQ multicore processor and ADRV9009 RF transceiver chip is proposed. The system employs a modular design for radar algorithms, generating waveforms from inter-pulse characteristics such as agility and PRI, and intra-pulse characteristics like FMCW, supporting flexible radar scalability. Tests show peak-to-peak and bandwidth errors of 0.94% and 0.121% in agility testing, RMS errors of 0.51, 0.42, and 0.47 for jitter, stagger, and sliding PRI measurements, 0.54% FMCW range error, and RMS symbol width errors of 0.005 3, 0.004 8, and 0.003 8 for 2, 4, and 8-phase coding. Compared to traditional simulators, this design offers high integration, low power, compact size, rich waveform concurrency, and wide frequency adjustment, enhancing radar testing and countermeasure training.