Abstract: The disclosure relates to a field of flexible low-voltage rail lighting system. It is provided with the mounting shell and flat conductor. The mounting shell is provided with the flat conductor inside and the lighting mechanism is installed between the mounting shell and the flat conductor. The lighting mechanism comprises the first lateral plate, second lateral plate, support layer and lamp film. Wherein, the first lateral plate and the second lateral plate are fixed on one end of mounting shell, respectively, there is a supporting layer fixed on both ends inside, and its bottom is fixed with lamp chips. The lamp piece is connected with the flat conductor, the lighting fixture could be mounted at any position on the flat conductor and the flat conductor is fixed more firmly on the mounting shell to prevent it from falling.