Abstract: Presently, the high power microwave(HPM) radiation systems are widely concerned by researchers, asa driver of HPM radiation system. Marx generator has the advantage because of its high output peak power, compact structure and small volume. This paper introduces the characteristics of a compact Marx generator with repetitive working frequency. Based on the theoretic analysis and experimental research, a 14-staged compact and repetitive Marx generator with inductive isolators is developed. It is charged synchronously with positive and negative constant current, and designed with spark switch and Marx high voltage insulation integrative, as well as omitted capacitance charging ground loop which makes the whole system concision and compact. According to debugging, its output voltage is up to 475 kV with a rise-time about 30 ns, and works stably in the repetitive frequency of 20 Hz when it fills with 0.16 MPa pure SF6.