Abstract: A tube light structure is provided. A tube electrical starting control board is enclosed in an inner space of the outer tube, and the two end portions of the outer tube are respectively disposed with two contact pins for inputting an electrical source to the electrical starting control board; and at least one tube lamp, wherein two end portions thereof are respectively disposed with a fixing part, two fixing pins are respectively disposed on outer part of the fixing part, one of the fixing parts is formed with an input terminal, and the tube electrical starter is inputted the electrical source by a wire passing through the input terminal. Accordingly, the heat-dissipating effect is increased by enlarging the inner space used for accommodating electrical devices, so that the electrical elements are not easily damaged due to poor heat-dissipating.