An optical fingerprint identification module includes a casing, an image pickup assembly, a light-guiding diffusion layer, a light-collecting reflective layer, a press plate, a light source and an optical tunnel structure. The optical tunnel structure is located under the press plate and located over the image pickup assembly. The optical tunnel structure is penetrated through the light-collecting reflective layer and a part of the light-guiding diffusion layer. After a light beam emitted by the light source is introduced into the light-guiding diffusion layer, the light beam is guided and diffused by the light-guiding diffusion layer and collected and reflected by the light-collecting reflective layer. Consequently, the light beam is transferred between the light-guiding diffusion layer and the light-collecting reflective layer. After the light beam is irradiated on the press plate through the optical tunnel structure, the light beam is reflected to the image pickup assembly.