Abstract: A wheel rim decorative lamp for mounting on the wheel rim of a vehicle comprises a motor assembly, a circuit board, a plurality of light emitting diodes, a light transmissive shell and a cover. The motor assembly includes a motor and a counterweight block, The motor has a rotating shaft and a housing. The light emitting diodes are disposed on one side of the circuit board. The light transmissive shell is disposed on one side of the circuit board. The cover disposed on one side of the circuit board is pivotally connected to the rotating shaft and drives the rotating shaft to relatively rotate with the housing, so as to generate electricity to actuate the light emitting diodes. Hence, the present invention improves safety and provides aesthetic feeling.