Abstract: The present invention discloses a light emitting device and a light-emitting connecting line. The light emitting device includes an LED light strip, a first clamping seat, a first light strip fixing pressing sheet, a second clamping seat and a second light strip fixing pressing sheet, the first clamping seat of the light emitting device may be clamped on a plug of a connecting harness or one end of cables of the connecting harness, and the second clamping seat may be clamped on the other ends of the cables of the connecting harness. According to the present invention, the LED light strip is convenient to mount and dismount, and after the light emitting device is assembled with the connecting harness via the two clamping seats, the connecting harness can achieve a colorful light emitting effect.