The invention is applied to the technical field of microwave and provides a microwave driving source mainly comprising a frequency synthesizer composed of a voltage adjusting control circuit, a voltage controlled crystal oscillator and a solid state oscillator, a cymometer, a modulator, a tuning controller, a microwave pulse power amplifier, a variable attenuator, a directional coupler, a detector, a power indicator and the like. The invention is characterized in that the output frequencies in the range from 40W to 200W are respectively and continuously adjusted, the frequency stability of output signals reaches to 5 multiplied by 10(-6), the frequency adjustment rang of output signals is larger than or equal to 4MHz, the driving source automatically indicate output frequency and output power in real time, the phase noise is low, and the clutter suppression ability is high.