The invention belongs to the technical field of LED lamps, and discloses a multifunctional LED bulb. The multifunctional LED bulb comprises a lamp body, LED lamps, a direct current power source, a PCB control panel, an interface connected with the outside, and a light-permeating cover, and further comprises an aluminum substrate. The LED lamps are a plurality of paster LEDs. The PCB control panel is arranged below the aluminum substrate, the direct current power source is arranged below the PCB control panel, and the interface is formed below the direct current power source. According to the multifunctional LED bulb, the built-in power source technology adopted in an LED lamp tube is adopted to the field of LED bulbs, the application range of the LED bulb is expanded, and the LED bulb can give off light through an external power source, can also give off light through the built-in power source when the current of the external power source is small and even can independently give off light without the external power source; meanwhile, the aluminum substrate capable of being separated from the lamp body serves as a carrier of the LED lamps, the LED lamps can be separated from the built-in power source easily, a user can replace the LED lamps conveniently, and the using cost of the LED bulb is effectively reduced.