Alternating current direct-drive LED lamp tube

The utility model discloses an alternating current direct-drive LED lamp tube which comprises a first LED branch, a second LED branch, a third LED branch, a forth LED branch and an LED shared branch, wherein the first LED branch, the second LED branch, the third LED branch and the forth LED branch form a bridge circuit. Multiple LED branches form the bridge circuit, and by utilizing the characteristics that LEDs have power-off afterglow continuous light and human eyes have inertia over flowing light spot memory, the human eyes consider that the LEDs working at an afterglow working mode continuous emit light; and as the LEDs in the lamp tube work half the time and are in a non-work state half the time, the heat produced by the LEDs can be reduced by 40 percent to 20 percent. Compared with the prior art, the LED lamp tube has the advantages of simple structure, low cost, high electric energy conversion efficiency, less heat accumulation, long service life and the like.