Disclosed is an organic silicon-nitrogen flame-retardant regenerated cellulose fiber, including silicon 5-15wt%, nitrogen 0.1-5wt%, oxygen 30-60wt%, carbon 20-40wt%, hydrogen 1-7wt%, titanium 1-7wt% and calcium 1-7wt%. The organic silicon-nitrogen flame-retardant regenerated cellulose fiber according to the present invention exhibits a higher limiting oxygen index, a better flame-retarding performance and a far infrared function, and the normal emission rate testing data reach the normal emission rate standard requirements of the textile article.
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