The utility model relates to a prevent curved LED fluorescent tube, be provided with a strip light source base plate and a tubulose support piece through setting up in the chamber accomodating of PC tube, tubulose support piece sets up as solid glass pipe and extends to in the end cap of tube both sides from the tube, this prevent curved LED fluorescent tube utilizes support piece's rigidity characteristics to overcome the defect of the easy modification of PC pipe, can prevent that the PC pipe from becoming curved, phenomenon such as flagging, and simultaneously, the drive board card that the position length design that utilizes PC pipe assembly to go into the end cap is greater than in the end cap connects the groove to arrive the distance of PC tube, in addition the support piece both ends in the PC tube are passed through to beat in the gluey fixed end cap, make PC tube and the end cap to realize perfect pick up fitting under the gluey circumstances need not beating, no longer has mutual restriction nature between PC tube and the end cap, thereby it freely extends and does not influence and put in order lamp length to make the PC tube can follow the axial when the thermal expansion, consequently this prevent curved LED fluorescent tube has and to prevent that curved and whole lamp length does not receive the advantage that expend with heat and contract with cold influences.