The invention discloses a sterilizing illuminating lamp with light condensation and transmission functions. The sterilizing illuminating lamp comprises a light collection device, a light transmission device, optical media, titanium dioxide particles and reflective films, and is characterized in that sun light collected in an outdoor environment is transmitted into an indoor environment and is diverged in the indoor environment by the aid of the optical media in the indoor environment, the optical media are arranged at a terminal of the light transmission device and are used as illuminating sources, and the discontinuous titanium dioxide particles are distributed on the outer surfaces of the optical media used as the illuminating sources; the light collection device is connected with the light transmission device, and the terminal of the light transmission device is connected with light incident ports in the outer surfaces of the optical media used as the illuminating sources. The sterilizing illuminating lamp has the advantages that the light enters the optical media used as the illuminating sources from the light incident ports in the outer surfaces of the optical media used as the illuminating sources, and irradiates on the discontinuous titanium dioxide particles distributed on the outer surfaces of the optical media used as the illuminating sources, and water molecules and oxygen molecules in air which flows around the inner surface of a reflector and the outer surfaces of the optical media used as the illuminating sources can be excited to form free anions with extremely high oxidizing power.