The invention relates to the technical field of power equipment, and in particular provides a VFTO (very fast transient overvoltage) suppression device and GIS (gas insulated switchgear) equipment using the VFTO suppression device. The VFTO suppression device comprises conducting rods arranged at an interval along own axial direction, wherein at least two or more branch conductors are arranged inparallel between the conducting rods, and the peripheral surface of each branch conductor is sleeved with a magnetic ring string set; transition rings in retaining fit with corresponding magnetic rings are arranged at two ends of the magnetic ring string sets to position the magnetic ring string sets; the outer side surfaces of the magnetic ring string sets and the transition rings are sleeved with resistor barrels; the inner ring surfaces of the transition rings are fixed to the branch conductors in a contact communication mode; the surfaces of the transition rings are fixed to the resistor barrels in a contact communication mode. The VFTO suppression device of the invention can solve the problem of complex processing and assembly of the conducting rods and resistors in the prior art.