The utility model provides a car brake disc waste heat power generation facility, it includes brake disc body and thermoelectric generation piece, the brake disc body is by shaft, inner disc, dish and interval equipartition are formed at the rib pole of between inner disc and outer dish outward, the thermoelectric generation piece sets up between two rib poles, laminates with the inner disc mutually in its hot junction, and inner disc and outer dish interval region are within a definite time arranged in to the cold junction. The utility model discloses simple structure, simple to operate has effectively solved in the past mechanical type brake power generation facility, because of the car space limit, and leads to the unable phenomenon emergence that install, is applicable to and installs in the car brake disc of all kinds of models.