The utility model discloses an omnidirectional antenna used for transformer substation partial discharge detection, which comprises a conductor cone, a conductor disk and a high frequency signal line, the conductor cone is placed on the conductor disk, the conductor disk is connected to the high frequency signal line. The disclosed omnidirectional antenna used for transformer substation partial discharge detection has the advantages of simple structure and easy installation, relative to a partial discharge monitoring system, the price is more reasonable, the omnidirectional antenna used for transformer substation partial discharge detection has isotropic directivity, can realize the omnidirectional reception of a transformer substation partial discharge electromagnetic wave signal, the bandwidth covers a frequency band range radiated by device of partial discharge , and the omnidirectional antenna used for transformer substation partial discharge detection has the advantages of safety and durability.