This paper focuses on the performance optimization of a trigger source for a triggered vacuum switch (TVS), and conducts an in-depth study based on the fundamental principles of the TVS trigger circuit. The research shows that the performance of the trigger source significantly affects the operating characteristics and service life of the TVS. A high-performance trigger source can not only ensure reliable conduction of the switch but also reduce trigger delay and dispersion, and weaken the influence of the polarity effect. By comparing the effects of different pulse transformer core structures and materials on performance and volume, a pulse transformer with a turns ratio of 6:240, a closed toroidal core structure, and iron-based nanocrystalline alloy material was selected. An actual experimental platform was built and tested. Under the conditions of a primary capacitor of 6 μF, a charging voltage of 110 V, and a secondary capacitor of 2 nF, the voltage rise time of the secondary capacitor was approximately 10 μs, successfully triggering the trigger electrode of a planar TVS. Through multiple experimental verifications, this trigger source can achieve stable and reliable triggering operations while ensuring performance, demonstrating its feasibility and reliability.