The invention provides a time-lapse photography system and method. The system comprises a rotating platform and an electronic device with a photography function, wherein the electronic device comprises a time-lapse photography module, a user sets a starting position, an ending position and a video recording time and computes a rotating angular velocity by use of the time-lapse photography module; when the electronic device executes a time-lapse photography program, the time-lapse photography module sends out a beginning signal and an indication signal containing angular velocity information; the rotating platform executes the rotating beginning from the starting position and adjusts the rotating speed according to the angular velocity information, and the electronic device executes a video recording program; when the rotating platform rotates to the ending position, the time-lapse photography module sends out an ending signal, the rotating platform stops rotating, and the electronic device ends the video recording program and generates a video. According to the time-lapse photography system provided by the invention, a user can conveniently perform the setting of the time-lapse photography according to the time-lapse photography module of the electronic device, so that the rotating platform installed with the electronic equipment can execute the rotation according to a setting result, thereby enabling the electronic device to smoothly generate the video of the time-lapse photography.