Provided is an LED lamp. The lamp comprises an operating assembly, a heat dissipation assembly, an LED illuminating assembly and a radiating assembly. The operating assembly comprises a support frame, a panel and a heat-conducting plate, wherein the panel is arranged on the support frame, and the heat-conducting plate is placed on the side face, away from the support frame, of the panel. The heat dissipation assembly comprises a heat dissipation panel, a heat dissipation frame, a motor, heat dissipation fan blades, a connecting curved bar, a placing platform, a plurality of first mounting plates and a plurality of second mounting plates. The LED illuminating assembly comprises multiple first light-emitting assemblies and multiple second light-emitting assemblies. The radiating assembly comprises a plurality of light-diffusing pieces, wherein each light-diffusing piece is arranged on one second mounting plate in a one-to-one corresponding way, and each second light-emitting assembly is placed in one light-diffusing piece in a one-to-one corresponding way. The LED lamp can illuminate the sample placed on the placing platform more thoroughly, meet the illuminating need when a user observes the sample, and focus light on the sample better. The light utilization rate is improved and the illuminating effect is good.