A type of highly efficient completely flexible fiber-shaped solar cell based on TiO2 nanotube array is successfully prepared. Under air mass 1.5G(100 mW/cm2) illumination condition, the photoelectric conversion efficiency of the solar cell approaches 7%, the highest among all fiber-shaped cells based on TiO2 nanotube array and the first completely flexible fiber-shaped DSSC at present. The fiber-shaped solar cell demonstrates good flexibility, which makes it suitable for modularization using weaving technologies.