Disclosed is an intelligent lane changing assist system based on data fusion. The intelligent lane changing assist system comprises a sensor, a lane changing control unit, an engine control unit, a steering control unit and an electric power steering unit. The sensor is used for real-timely detecting environment information between a vehicle and surrounding vehicles. The channel changing control unit is used for receiving the environment information sent from the sensor. Crashing time can be calculated real-timely through the environment information. When the crashing time is less than a time set value, the lane changing control unit calculates anti-crashing steering angles and anti-crashing steering torque needed by the vehicle according to the environment information, according to the fact that whether the anti-crashing steering torque is in a reasonable range or not, the fact that the steering control unit controls steering of the electric power steering unit is determined, or accelerating of the vehicle is controlled by the engine control unit, and the fact that the vehicle crashes the surrounding vehicles is avoided. The invention further provides an intelligent lane changing assist method based on the data fusion.