The invention discloses a magnetic probe device. The magnetic probe device comprises a magnetic probe body and a signal processing circuit; the output end of the magnetic probe body is connected withthe input end of the signal processing circuit; the signal processing circuit comprises a first capacitor, a second capacitor, a Faraday shielding device and a boosting transformer; the Faraday shielding device is fixed between a primary side coil and a secondary side coil of the boosting transformer; the primary side coil of the boosting transformer is provided with a center tap, and the center tap is grounded; and the first end of the primary side coil is connected with the first capacitor in series, and the second end of the primary side coil is connected with the second capacitor in series. By adopting the magnetic probe device, the signal-to-noise ratio of the magnetic probe can be improved, and the measuring precision of a magnetic field in plasmas can be improved.