An illuminating lamp having a grip, a transparent sleeve, being attached to the front end of the grip, and three lamp receptacles side by side being provided in the transparent sleeve, wherein an intermediate lamp is fixed in the transparent sleeve, and the pivot axis on the tail ends of the left and right lamp receptacle out of the bottom surface of the transparent sleeve whereby the left and right lamp receptacle is capable of rotating in the transparent sleeve; two driven gears engaged with each other are fit on the pivot axis, one of the two driven gears being engaged with a transmission gear; and a rotor provided between the transparent sleeve and the grip, on the inner wall of the rotor being provided with a teeth to engage with the transmission gear; wherein when the rotor rotates, the transmission gear will be driven by the teeth on the inner wall of the rotor, and the transmission gear will sequentially transmit the force to drive the two driven gears to rotate, and simultaneously the left and right lamp receptacle rotates whereby the user may render the three lamp receptacles in connection to appear triangle or rectilinear to select a unidirectional or omnidirectional illumination depending on need.