A bicycle display lamp structure, including a casing, a circuit board disposed within the casing, a display body, a plurality of light source elements, and a clamping device located on the casing. In which the light source elements produce light sources, which are guided by the display body. The display body is provided with a light guiding area, the surface of which is provided with light reflecting portions of different words or patterns formed from an arrangement of concave points or grooved lines. Accordingly, the clamping device is used to clamp onto a bicycle, and the light sources projected by the light source elements proceed along the light guiding area of the display body and reflect outward from each of the reflecting portions, and further cause the words or patterns to be in a constantly lit or flashing state to achieve a cautionary function for rear oncoming vehicles.
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