The invention provides a method of optimizing high-frequency magnetic rings used for restraining very fast transient overvoltage. The method of optimizing the high-frequency magnetic rings used for restraining the very fast transient overvoltage comprises acquiring the structure of installing a gas insulate switchgear (GIS) of the high-frequency magnetic rings and an arrangement condition of electrical equipment in an electric substation with the GIS, confirming a performance index limiting condition of the high-frequency magnetic rings according to the structure of the GIS and the arrangement condition of the electrical equipment, inputting the performance index limiting condition into a pre-built equivalent electromagnetic transient model of the high-frequency magnetic rings, calculating suppression effect of different high-frequency magnetic rings satisfying the performance index limiting condition in a simulating mode on the very fast transient overvoltage through the equivalent electromagnetic transient model, and acquiring an optimized parameter of the high-frequency magnetic rings according to the suppression effect. According to technical scheme of the method of optimizing the high-frequency magnetic rings used for restraining the very fast transient overvoltage, the optimal optimized parameter of the high-frequency magnetic rings is acquired, a predetermined suppression target and the maximum optimized effect of the sizes and the weights of the high-frequency magnetic rings are achieved under a limiting condition, and therefore maximum technology economy is achieved.