The utility model discloses a micro hollow antibacterial PTT fiber, whose characterize is that the section is hollow after blending the PTT and the nano lamellar silver inorganic antibacterial agent. The advantages of the utility model are: the fiber spun by the blending fusion of the new composite material PTT and the nano lamellar silver inorganic antibacterial agent is comfortable and excellent in dyeing; the main characteristic of the special fiber is hollow containing a lot of non-flowing air, so the textiles using this fiber are of small density and excellent warm-keeping; the nano lamellar silver inorganic antibacterial agent has good antibacterial performance, and possesses the environmental and safety performance. The utility model can be used widely in suits, jackets, outer wears, high class bat wool, down-like garments, or linings, sleeping bags (goose down, duck down) and also in the fields of the exposure suits, winter sports clothes, raised textiles, non-woven cloth, blanket and so on.