It has complex process and lower efficiency when traditional electrospinning preparation method is used to prepare the poly (vinylidene fluoride) (PVDF) piezoelectric fibers, so this paper proposes a new method for the PVDFs by using a rotation drum to collect aligned PVDF nanofibers. Aligned fiber membranes with different alignment degrees were collected by changing the rotating speed. Then, the Fourier Transform Infrared (FTIR) spectroscopy was used to analyze the content of β phase of the fiber membranes and a data acquisition card of National Instrument (NI) was used to research the piezoelectric property of piezoelectric fiber membrane under the same pressing force. The results show that the order of fiber alignment and the content of β phase are both improved as the rotating speed increasing, and the output voltage of piezoelectric also increases, which indicates that the change of rotating speed has the same influence on the content of β phase and the output voltage. Based on the aligned PVDF fiber membrane, a pressure sensor was designed and its dynamic responses under different air pressures were obtained with a lab-made testing system. In the pressure range of 0.145-0.165 MPa, the piezoelectric output of the sensor increases linearly with the increment of air pressure, showing excellent linearity and high sensitivity up to 179 mV/kPa. The preparing method for PVDF nanofibers has wide application prospects，especially in the field of high accuracy dynamic pressure tests.