A light-emitting diode (LED) bulb comprises a light-permeable bulb shell, an LED luminous source, a stem, a driver and an electric connector, wherein the stem is provided with a support pillar, a horn tube, an exhaust tube and electric lead wires; the bulb shell and the stem are sealed in a vacuum mode, and low-viscosity high-thermal-conductivity gas is filled in the bulb shell; the LED luminous source is composed of at least one transparent LED light-emitting column; the LED light-emitting column comprises a high-thermal-conductivity transparent tube inserted in the outer surface of the support pillar; at least one string of LED chips and a luminescent powder layer are arranged on the surface of the transparent tube; the chips are in series connection or in series-parallel connection, electric lead wires of chip electrodes are connected with the electric lead wires of the stem, a stem electrical connection wire is connected with the output end of the driver, the input end of the driver is connected with the electric connector, and the electric connector is communicated with an external alternating current (AC) or direct current (DC) power supply. The LED bulb has the advantages that thermal resistance between the LED chips and the heat dissipation gas is low, heat dissipation effect is good, an LED bulb with higher luminous flux and higher luminous efficiency can be manufactured, the light-emitting component is firmly fixed, can withstand strong shock, and is high in reliability, and the LED bulb is simple in manufacturing process and low in cost.