The utility model discloses a car weather keeps off into glues a mouthful shearing mechanism for two shear two between automobile weather fender and the runner advances jiao kou, which comprises a frame, a positioning mechanism for being directed at the car weather keeps off and the runner advances line location, a shear mechanism and power unit for shearing advance jiao kou, positioning mechanism installs in the frame, it goes up and down with the direction of height that frame swing joint can follow the frame to shear the mechanism, shearing mechanism lies in positioning mechanism's top, the lower extreme of shearing the mechanism has and is used for shearing respectively two and advances jiao kou's two and shear the end, it sends out a heat -insulating material all to be equipped with in the two shearing ends, two shear the end corresponds respectively and lies in two and advance jiao kou directly over, power unit installs in the frame and is used for control to shear the lift of mechanism, the utility model discloses a power unit control is sheared the end and is realized shearing advancing the accurate of jiao kou, control accurately, and the shearing quality height is sheared efficiently, has reduced the shearing degree of difficulty simultaneously.