According to the requirements of pulsed electron beam welding technology, the design of high-frequency pulsed electron beam bias circuit with adaptive closed-loop adjustment of beam current is realized by taking the structure design of fast controllable DC bias main circuit and the control circuit design of adaptive closed-loop adjustment of beam current as the core technology; The circuit parameters are simulated and verified by Cadence simulation software, and the circuit parameters are optimized. On this basis, a high-frequency pulsed electron beam bias circuit is developed, and its characteristics are verified by connecting it to the electron beam welding system. The results show that the pulsed electron beam can follow the set signal dynamically in real time, the working frequency can reach 1 kHz, the rising and falling speed of the beam is fast, the waveform is good and the distortion is small, which can effectively meet the requirements of the pulsed electron beam process.