Real-time online key transmission device and method for power terminal networking scene

The invention discloses a real-time online key transmission device and method for a power terminal networking scene, and the device comprises a transmitting end which comprises a digital edge pulse generator, a frequency synthesis circuit, a pulse control switch circuit, and a transmitting antenna. The digital edge pulse generator processes an input secret key signal into a bipolar pulse signal; the frequency synthesis circuit provides a first sine wave signal and a second sine wave signal with different frequencies; the pulse control switch circuit is respectively connected with the digital edge pulse generator and the frequency synthesis circuit, and selectively outputs a first sine wave signal or a second sine wave signal according to the polarity of the pulse output by the digital edge pulse generator; and the pulse control switch circuit further sends the first sine wave signal or the second sine wave signal to the receiving end through the transmitting antenna. According to the invention, the secret key