An LED lamp unit, comprising a light-emitting body having a hollow tube shape, a translucent cover and end caps. LED light-emitting elements are fixed on the light-emitting body and/or the translucent cover. The centers of the end caps are provided with opening holes, and at least one end of the light-emitting body is provided with an electrical connection component connected to the LED light-emitting elements, the electrical connection component extending out of the end cap, the end cap of the end provided with the electrical connection component being provided with an outwardly extending circumferential surface, ventilation holes being provided on the circumferential surface. The LED lamp unit has a simple structure, implements 360 degree omnidirectional illumination, and has a large light-emitting angle and high light-emitting efficiency. The LED lamp unit is provided with a heat dissipation channel in communication with the outside air, heat dissipation performance is good, and the service life of the LED lamp unit is increased.