Satellite-borne wave division multiplexing system capable of realizing redundant interconnection

The invention discloses a satellite-borne wave division multiplexing system capable of achieving redundancy interconnection, and the system comprises one or two identical devices; each device comprises an electro-optical conversion link and a photoelectric conversion link; the electro-optical conversion link and the photoelectric conversion link are both provided with main channels and standby channels serving as redundancy backups, and the main channels and the standby channels of the electro-optical conversion links comprise electro-optical conversion units and n-to-1 wavelength division multiplexing units; the 2-to-1 wavelength division multiplexing unit is provided with a multiplexing port, the main channel and the standby channel of the photoelectric conversion link respectively comprise a 1-to-n wavelength division demultiplexing unit and a photoelectric conversion unit; the 1-to-2 wavelength division multiplexing unit is provided with an optical port, and the optical port is connected to a panel of the device. Each device is in redundant design, and the two devices can be mutually backed up after being interconnected, so that the reliability is greatly improved; the wavelength division multiplexing architecture enables the number of external optical fibers to be halved after two devices are interconnected, and the design difficulty of the system is greatly reduced; and the modular design of the equipment enables each piece of equipment to be close to a high-speed interface connector, reduces the transmission distance of high-speed signals, and improves the transmission rate.