An LED lamp comprises a heat dissipation lamp cup (1) having a hollow inner structure and openings at two ends and comprises a driving power supply housing (2) sleeve-connected to the heat dissipation lamp cup (1). The outer diameter of the driving power supply housing (2) is smaller than the inner diameter of the heat dissipation lamp cup (1). A heat dissipation channel vertically running through the openings at the two ends of the heat dissipation lamp cup (1) is formed between the driving power supply housing (2) and the heat dissipation lamp cup (1). Upper and lower portions of the heat dissipation channel are both in communication with the outside air, so that air can enter the heat dissipation lamp cup (1) and take away the heat generated by a driving power supply, so as to not only prevent the heat dissipation lamp cup (1) from affecting the driving power supply, but also perform effective convectional heat dissipation on the driving power supply, thereby decreasing the rise of the ambient temperature of the power supply by about 5%.
