An outdoor LED lamp assembly includes a receiving member and an LED lamp mounted on the receiving member. The LED lamp includes a heat sink and a plurality of LED modules mounted on the heat sink. The receiving member includes a bottom plate. A plurality of screw assemblies extends through the bottom plate to engage with the receiving member to mount the bottom plate on the receiving member. Each of the screw assemblies includes a screw and a circlip snapping the screw. The screw includes a head and a thread portion extending from the head. The threaded portion threadedly engages in the receiving member. The bottom plate of the receiving member is sandwiched between the head and the circlip. A wire interconnects the receiving member and the bottom plate. The screws are remained on the bottom plate when the screws are loosened from the receiving member.