An LED lamp includes a heat conductive housing, a light source module and a light-pervious cover. The interior of the heat conductive housing is provided with a heat conductive partition plate capable of dividing the interior of the heat conductive housing thereby forming an accommodation space having a cavity at one end of the heat conductive housing. The light source module is disposed in the accommodation space and includes a circuit board and at least one LED disposed on the circuit board. The light-pervious cover is formed with a sleeve opening, and the periphery of the sleeve opening is protrudingly formed with an annular wall, the outer edge of the annular wall is mated and engaged with the inner edge of the cavity, thereby enabling the circuit board to be pressed by the annular wall so as to be tightly fastened on the heat conductive partition plate.