An LED lamp includes a bracket, a supporting plate mounted on the bracket, and a plurality of LED modules mounted on the supporting plate. The bracket includes a bottom plate, two sidewalls and two engaging portions. The two sidewalls respectively connect to two opposite sides of the bottom plate and extend upwardly from the bottom plate. Two protruded portions respectively obliquely extend from inner surfaces of the two sidewalls to define two grooves therebelow, respectively. The supporting plate has two opposite sides respectively slidably received in the grooves. A bottom surface of the supporting plate thermally contacts with a top surface the bottom plate. The LED modules are mounted on a top surface of the supporting plate.