A disk box with a flashing circuit comprises a box seat, a positioning disk, and an upper cover. A circuit board with light emitting diodes and batteries are installed at a bottom side of the box seat. A lateral side and a flat portion at an end of a positioning disk are adhered with drawings. Thereby, by above structure, the positioning disk may cover the box seat, and then the upper cover covers the positioning disk so as to be formed as a disk box. Thereby, as the user presses the push button so that power of the battery flows to the circuit board to conduct the light emitting diodes, a flash effect will present to inform the user to keep attention.