The invention discloses a driver distraction driving detection and early warning system and method under vehicle turning and lane changing scenes. The system comprises a data acquisition unit, a dataprocessing unit, a judgment unit and an early warning unit. The data acquisition unit collects vehicle and driver state information in real time, and a vehicle turning/lane changing scene judgment standard is established in advance; and the index characteristic ranges of the three states of the driver are outputted through a clustering algorithm in advance, and the index characteristic ranges areinputted into a data processing unit for comparison with collected real-time data. When the vehicle enters a turning/lane changing scene in the actual running process of the vehicle, the data acquisition unit collects vehicle and driver state information in real time, inputs the vehicle and driver state information into the data processing unit, and judges whether the driver has a distraction driving state or not. Finally, two levels of early warning information are sent by the early warning unit. According to the driver distraction driving detection and early warning system and method, the situation that the vehicle enters the turning/lane changing can be accurately identified, and the driver distraction state can be comprehensively and accurately judged and prewarned.