A light-regulating mechanism comprising a first ball head connector, a second ball head connector, a third ball head connector and a sliding connector. One end of the first ball head connector and one end of the second ball head connector are connected to an illumination unit. The other ends thereof are connected to a supporting frame or a light body. The illumination unit is provided with a sliding support. The sliding connector can slide on the sliding support. One end of the third ball head connector is connected to the sliding connector in a sliding manner, and the other end thereof can move on the supporting frame or the light body to drive the sliding connector to slide on the sliding support, so that light regulation in a first direction is realized. Further disclosed are a vehicle light module comprising the light-regulating mechanism, a vehicle light and a vehicle.