An LED lamp includes a heat sink, a plurality of LED light boards, an LED driving power and a diffuser. The heat sink has a long hollow tubular structure. The heat sink includes a top plate and a plurality of mounting plates, and an angle is defined between two adjacent mounting plates. The LED light boards are arranged on outer surface of each mounting plate. The outer surface of the top plate is exposed to air. The diffuser covers all the LED light boards, and is connected with the heat sink. Two end covers are separately arranged on two ends of the heat sink. The LED lamp in the present disclosure has the advantages of compact structure, good heat dissipation effect, large luminous angle, good waterproof effect, convenient connection and so on.