The invention provides a lane change decision-making method and device for an autonomous vehicle. The method includes the following steps: defining a candidate strategy set for a lane change decisionof the autonomous vehicle; and determining a reward value of each strategy in the candidate strategy set for the lane change decision of the autonomous vehicle by using an evaluation function, and selecting the strategy with the maximum reward value as the lane change decision. The technical scheme provided by the invention mainly improves the decision-making ability of the autonomous vehicle, andespecially has a good decision-making effect for complicated automobile driving scenes.