The invention discloses an energy-saving lamp capable of achieving brightness adjustment. The energy-saving lamp comprises an energy-saving lamp body, a lamp head and a lamp hood, wherein the lamp head is fixedly connected to the top of the energy-saving lamp body, a connecting thread is fixedly connected to the periphery of the lamp head, a waterproof hood is fixedly connected to the bottom of the lamp head, a lamp holder is connected to the top inside the waterproof hood in an embedded manner, and a control circuit board is connected to one side of the lamp holder in an embedded manner. LEDlamp bulbs are fixedly connected to the bottom of a connecting plate, each set of the LED lamp bulbs are connected in parallel and can be independently turned on or turned off, and therefore using ofthe energy-saving lamp body can be more energy-saving and environment-friendly. A photosensitive component can induce the light intensity and automatically adjust brightness of the energy-saving lampbody, and therefore brightness adjustment of the energy-saving lamp body is simpler. By means of the heat emission holes, the emission speed of heat in the energy-saving lamp body can be accelerated,and the service life of the energy-saving lamp body is prolonged. A connecting thread connection mode and a staple bolt connection mode are simultaneously adopted by the energy-saving lamp body, and using adaptability of the energy-saving lamp body is improved.