Solar power device used in bicycle

A solar power device (1) used in a bicycle includes at least one flexible dye sensitized solar cell or DSCC (10) provided on the bicycle, a power source processing unit (12) comprising at least one rechargeable battery (121) and a control circuit board (123), and a load electrically connected to the rechargeable battery. The control circuit board is provided with at least one electronic component electrically connected to the rechargeable battery and the flexible dye sensitized solar cell for converting an electric current generated by the flexible dye sensitized solar cell into a charging current to charge the rechargeable battery. The present invention employs the flexible dye sensitized solar cell that can be tightly adhered to a frame of the bicycle easily without affecting the external appearance of the bicycle.