A lamp tube fixing base of the invention comprises a fixing base sleeved outside of the lamp tube and a moving cover plate of the fixing base, the cover plate is axially opened or closed along the lamp tube, the lamp tube fixing base is also provided with a cutting sleeve device for preventing the cover plate from disengaging from the base. The invention has the beneficial effect that the cover plate of the lamp tube fixing base and the open/close of the base are arranged along the axis of the lamp tube, which reduces the influence of the gravity of the lamp to open/close the cover plate, improves the fixing intensity of the lamp, and guarantees the safety of the lamp in the case of violent vibration.