Vehicle cruise control method and device

The invention discloses a vehicle cruise control method and device, relates to the technical field of vehicle manufacturing, and solves the problem of high energy consumption during vehicle cruise control. The method is applied to a vehicle control system. The method comprises the steps of obtaining the actual speed of a vehicle at the current moment; judging whether the actual vehicle speed at the current moment is within a target range, the target range is determined based on the tolerance range of the target vehicle speed of the vehicle, and the tolerance range is the range allowing the target vehicle speed to fluctuate; if the judgment result is yes, controlling the vehicle cruise according to the target value of the cruise torque; if not, adjusting the target value to control the actual vehicle speed of the vehicle at the first moment to be within the target range; wherein the cruise torque is torque output by an engine of the vehicle from a crankshaft end, and the first moment is any moment occurring af