Abstract: Disclosed is a bicycle riding taillight with brake laser warning, which includes: a light housing comprising a housing body and a bottom cover sealing the housing body; a circuit board disposed inside the light housing; a light source device, disposed on an inner side of the bottom cover and electrically connected to the circuit board, and configured to provide lights of different modes; a power source disposed on one side of the circuit board, and configured to provide power for the light source device; a photosensitive sensor disposed at one end of the light housing and connected to the circuit board, and configured to sense ambient light; and a vibration sensor disposed inside the light housing and located at one end of the circuit board, and configured to sense a riding condition of a bicycle.