The work aims to design and develop a bending fatigue life measurement instrument of packaging film, in order to reliably measure the bending fatigue life of the thin film battery packaging film. Mainly composed of mechanical movement components, motion control system and fixed protection components, etc., the instrument was used to test the thin film battery packaging film and study the effects of cyclic bending on the packaging film. The finite element simulation was used to analyze the internal stress changes of packaging film when the thin film battery was bent. With the increase of bending angle, the bending stress on the packaging film increased continuously. In the bending cycle test, with the increase of cycle times, fatigue cracks would occur on the surface of the packaging film, which would destroy the bonding state of the transparent electrode and affect the photoelectric performance of the battery. The fatigue life curves of packaging films under different bending angles were obtained. The instrument is featured by easy operation. The bending fatigue life testing based on the instrument can effectively improve the reliability of thin film battery packaging.