The invention provides a lane keeping method and a lane keeping device. The method comprises the following steps of acquiring image information of a lane where a vehicle is positioned; analyzing the image information of the lane to obtain position information of a lane line of the lane; acquiring position information of the vehicle by a GPS (Global Position System), and acquiring acceleration information of the vehicle by an acceleration sensor; judging whether the vehicle deviates from the lane or not by combining the position information of the lane line of the lane, the position information of the vehicle and the acceleration information of the vehicle; if yes, promoting a user that the vehicle deviates from the lane. According to the lane keeping method and the lane keeping device provided by the invention, the vehicle is enabled to drive according to a dedicated lane, and the precision of lane keeping is improved; meanwhile, the driving safety is improved, and the user experience is improved.