This study reports a flexible technology for identifying the fingerprints using the piezoelectric polyvinylidene fluoride (PVDF) materials. The flexible PVDF has successfully developed to identify the fingerprints by an electric charge of the piezoelectric character. The fingerprint sensors were fabricated using the polymer MEMS (micro electromechanical systems) technologies and integrated into the flexible polyimide substrate. The study focuses on the 3D array fabrication for reducing surface tension of each PVDF pixel and the dynamic control circuit for acquiring the piezoelectric signals. Experimental results show the 3D array patterns by pressing on PVDF film have a good structure, and each pixel is more freedom that means the pixel is unrestricted on top surface and can reduce the couple effect of each pixel. The depth of micro array is about 15 μm and the response speed of the flexible fingerprint sensors are as fast as 5 ms. Therefore, the aim of this study is to speed up the technology for promoting the flexible fingerprint. The feasibility studies also show the molding transfer is an appropriate low-cost technology for fabricating of the flexible piezoelectric fingerprint sensor. Furthermore, the PVDF has a good mechanical strength and electrochemical stabilities for fingerprint sensor applications.