The invention relates to a method for reducing the hairiness of PTFE (Polytetrafluoroethylene) film-broken fiber. The method comprises the following steps: paving 30 to 50 bundles of conventional PTFE film-broken fiber bundles into a tiled bundle layer; then continuously carried out three times of processing steps of combing and tidy arrangement of a guide bar, feeding of a feeding roller and jet impact cutting and hairiness removing of vertical water sprayed by a horizontal type spunlacing unit which is provided with three spunlacing head components, thus realizing nine times of spunlaced hairiness removing on the tiled bundle layer, and preparing the PTFE film-broken fiber of which the hairiness quantity in unit length is reduced by 55.5 to 68.7 percent than that of the prior art. According to the method for reducing the hairiness of the PTFE film-broken fiber, disclosed by the invention, a flexible spunlacing technology is adopted, and high-speed and sustainable hairiness removing can be carried out; after the prepared PTFE film-broken fiber is cut off, the combining speed is high, the wet formation is uniform, and a prepared filter material is small in pores and high in pore uniformity degree, and the prepared PTFE film-broken fiber can be widely applied to high temperature-resisting filter material with high dedusting efficiency.