The invention discloses a broadband high-dynamic radio-frequency direct quadrature modulation device and relates to a direct quadrature signal modulation device having a wide working band and a wide output dynamic scope and controlled by a program in the field of satellite navigation test. The broadband high-dynamic radio-frequency direct quadrature modulation device is mainly composed of a baseband signal input and control interface, a difference reconstruction filter, a direct quadrature modulation module, a local oscillator signal generating module, a communication and control module, a large-step damping module, a small-step damping module, a power supply terminal, a program burn interface, and the like. The broadband high-dynamic radio-frequency direct quadrature modulation device realizes the baseband quadrature signal direct quadrature modulation up-conversion with wide working band and wide output dynamic scope by adopting a high-performance broadband phase-locked loop technology and a large-and-small step combined damping control technology, has the characteristics of miniaturization, simple interface, convenience in debugging, perfect function, excellent performance, flexibility, controllability, and the like, and is especially suitable for a Beidou navigation system as a radio-frequency emission front-end of a multi-system navigation signal or navigation interference signal generating device.