An illuminant assembly structure comprises a hollow cover and an luminous device: the cover is concavely provided with an accommodating groove at the bottom for at least a conductive part accommodated inside and has several raised rims extending from the cover's inner edge; the luminous device comprises a circuit substrate and a shield and has at least a rotary vane extended from its outer surface wherein the circuit substrate is provided with a plurality of illuminants and rotary vanes including resilient electrodes and the shield allows a plurality of opening units to be opened on each rotary vane. The resilient electrodes are exposed via the shield's all opening units and are tightly coupled with the conductive parts for the illuminants growing with the luminous device installed on the cover's center and turned to a specific angle.