The invention provides a camera lens for space environment narrow-band imaging observation. The camera lens comprises a lens cone (6), a first lens set (1), a second lens set (2), a narrow-band filer plate (3) and a diaphragm (4), wherein the first lens set (1), the narrow-band filter plate (3), the diaphragm (4) and the second lens set (2) are successively arranged in the lens cone (6) in parallel in an incidence direction of a light path; the first lens set (1) is used for regulating an angle of light which comes into the space environment, so that the light is adaptive to an incidence angle requirements while coming into the narrow-band filer plate (3), and is matched with the narrow-band filer plate (3) to realize narrow-band filtering; the second lens set (2) is used for performing re-imaging processing on light which comes out of the narrow-band filter plate (3) to correct lens aberration errors to obtain low distortion imaging effects. The camera lens is suitable for performing TDI (Time Delay and Integration) imaging on a faint light source with bandwidth of several nanometers in the space environment.