The invention provides a Gaussian filter minimum shift frequency keying-based optical wireless fusion system and a Gaussian filter minimum shift frequency keying-based optical wireless fusion method. In the system, a signal device comprises N signal source modules, wherein each signal source module generates two analog electrical signals; a link device performs optical modulation on received analog electrical signals through an optical link, and transmits N modulated independent optical signals and an unmodulated optical signal; and a receiving device processes the received N modulated independent optical signals and the unmodulated optical signal to acquire information-carrying data so as to realize optical wireless fusion transmission. The method and the system can reduce system cost, improve system performance, and effectively provide multi-user services.