A light mechanism for an umbrella, the umbrella comprises a column, a plurality of long rods, a plurality of short rods, a nest and a battery module, the light mechanism comprises at least one light rod assembly. Each long rod has an end, the light rod assembly is detachably connected to the end of the long rod through a rod connector; the light rod assembly comprises a hollow light rod and a light strip arranged inside the light rod, the light strip is electrically connected to a power-supply end of the long rod. The light rod assembly is connected to the long rod by insertion, the female electrical connector is positioned inside the light rod, and the male electrical connector is positioned inside the long rod. The present invention is simple and rational in structure design, convenient and quick to assemble or disassemble. Since the light rod is convenient to disassemble, it is greatly convenient for daily maintenance.