An improved lampshade of an LED lamp, assembled onto the port of hold tank on the main body of LED lamp so that light-reflection modules located between port of hold tank and LED modules in the hold tank are positioned securely. The lampshade has a circumferential locating surface and a limitation surface. The circumferential locating surface is adapted with the wall edge of hold tank to define an inner edge and an external edge. The limitation surface is recessed into the circumferential locating. A snapping portion is placed at the coupling portion of the circumferential locating surface and wall edge of the hold tank for positioning of the lampshade.