Fender positioning tool and fender self-adaptive positioning method

The invention discloses a fender positioning tool and a fender self-adaptive positioning method. The device comprises a bottom layer frame, an upper layer frame and a centering mechanism, the bottom of the bottom layer frame is provided with a positioning mechanism used for conducting three-direction positioning with a vehicle body, the upper layer frame is installed above the bottom layer frame through a sliding mechanism, and the X-direction displacement of the upper layer frame relative to the vehicle body can be adjusted through the sliding mechanism; the centering mechanism is installed on the top of the upper-layer frame, Y-direction displacement of the upper-layer frame relative to a vehicle body can be adjusted through the centering mechanism, clamping mechanisms used for fixing a fender are arranged on the two sides of the upper-layer frame respectively, a linkage mechanism is further arranged on the upper-layer frame, and the two ends of the linkage mechanism are connected with ...