The embodiment of the invention discloses a determining method and device for the positioning precision of an unmanned vehicle. The method comprises the steps that positioning coordinate is obtained by real-time positioning according to sense positioning data of the unmanned vehicle; the real coordinate information of the unmanned vehicle is determined according to GPS data, IMU data and laser point cloud data of the unmanned vehicle; the obtained positioning coordinate information and the determined real coordinate information are matched, and the positioning precision of the unmanned vehicle is determined according to a matching result. According to the technical scheme, the positioning precision of the unmanned vehicle can be determined; besides, the accuracy of positioning precision is high, and preparation work is made for determining the driving route of the unmanned vehicle based on a positioning result.