Abstract: A heat pipe comprises a first pipe and at least a second pipe. The first pipe includes an evaporator, a heat insulator and a condenser communicating with each other to define a hollow chamber. Two ends of first pipe along an axial direction of the heat pipe are sealed. The second pipe is disposed in the hollow chamber and includes an accommodating space and a first capillary structure disposed in one end of the accommodating space closer to the evaporator. The hollow chamber of the first pipe is mainly a channel for vapor, the second pipe is mainly a channel for working fluid, the vapor is driven by the vapor pressure difference to move in the first pipe and from the evaporator to the condenser, and the working fluid is driven by the vapor pressure difference to flow in the second pipe and from the condenser to the evaporator.