The invention discloses a Faraday probe, relates to the technical field of aerospace instruments, and aims at solving the technical problems of low measurement accuracy of the present Faraday probe. The Faraday probe comprises a Faraday probe body. The Faraday probe body comprises a collection ring, a collection protection insulation device and a protection ring. The external side of the collection ring is sleeved by the collection protection insulation device. The external side of the collection protection insulation device is sleeved by the protection ring. The collection protection insulation device and the collection ring are fit in an interference way. The collection protection insulation device and the protection ring are fit in a clearance way.