The invention provides a device and a method for controlling driving of a vehicle in a coasting situation. The device comprises a speed detector, a sliding driving scope determiner and a controller. The speed detector detects a current speed when signals form an accelerator pedal position sensor and a brake pedal position sensor are both zero. The sliding driving scope determiner determines the capability of sliding driving through receiving a current position of a vehicle, road conditions and position information in a planed driving direction and information relevant to distance between vehicles when the current speed is no smaller than a specified speed. The controller determines the capability of sliding and closes a motor when the distance between a vehicle and a front vehicle is no smaller than a preset distance.