An illuminable electronic ice cube comprising an outer casing, inner unit, LED, circuit board, battery, bottom lid, and battery cover lid. The outer casing has a natural ice cube shape with ripple-shaped sides. The inner unit is fitted in the outer casing and comprises a base, a raised support and an-illuminable light cylinder fixed on the raised support. A chamber in the inner unit runs through the base, raised support and light cylinder. The LED is fitted in the light cylinder and the circuit board is under the LED, and the battery is under the circuit board. The bottom lid is at the bottom of the outer casing and has a push-button switch and a hole matching the battery cover lid. When the battery runs out, the battery cover lid is turned to separate it from the bottom lid, so a new battery can be installed.