The invention discloses a driving safety device based on driver's biological data. The device comprises a detection unit, an analysis unit and an execution unit, wherein the detection unit is used for collecting the biological data of a driver and in signal connection with the analysis unit through a vehicle-mounted Bluetooth communication protocol, the analysis unit receives the biological data from the detection unit and analyzes the current specific eating state of the driver, and the execution unit controls safety settings of a vehicle according to the specific eating state. According to the driving safety device, directed at the bad driving habit of eating during driving, an appropriate and accurate safety control strategy is adopted, and accordingly, the driving safety is greatly improved.