The invention provides a medical endoscope containing a structured light three-dimensional imaging system, which relates to a medical endoscope, solves the problem that the conventional three-dimensional observing technology can not be directly applied to the medical endoscope due to space limit in the brain surgery of nasal cavity expansion. The medical endoscope comprises a working scope tube, a computing and processing module and a structured light channel, wherein the working scope tube comprises an imaging channel and an illuminating channel; illuminating optical fibers are arranged in the illuminating channel; the signal input end of the computing and processing module is connected with the electric signal output end of the imaging channel; the structured light channel is arranged in the illuminating channel; the light beam outputted from the tail end of the illuminating optical fiber is received by the structured light channel; the light beam generates structured light after passing through the structured light channel; and the structured light is outputted out of the illuminating channel through the structured light channel. The invention overcomes the defects of the priorart and can be applied to the brain surgery of nasal cavity expansion.