Secret-related network time synchronization system and time service method

The invention discloses a secret-related network time synchronization system and a time service method, which can synchronize secret-related network time without threatening network information security, the system comprises a GNSS receiver provided with a GNSS antenna and a BPC module provided with a BPC antenna, the GNSS receiver and the BPC module are both in communication connection with a clock module, the GNSS receiver can receive satellite navigation signals and send calculated time information to the clock module, the BPC module can receive BPC low-frequency time code information and send the calculated time information to the clock module, and the clock module is in communication connection with a secret-related network. The clock module can receive time information output by the GNSS receiver and the BPC module, adjust an internal clock in real time and send the time information to the secret-related network, the GNSS receiver, the BPC module and the clock module are all in communication connection