The utility model provides a scribing device for a core penetrating bolt and mainly aims at solving the problem that the two ends of a core penetrating bolt are inconsistent in extension length due to the fact that the core penetrating bolt is installed manually. The device comprises a base and guide screws, wherein the base is provided with a groove, and a first fastening screw which is capable of being screwed in the groove is arranged on the base; the guide screws are arranged on the base, the guide screws comprise a first guide screw and a second guide screw which are symmetrical and opposite in spiral direction, a crank is arranged at one end of one of the guide screws, and guide screw nuts are arranged on the first guide screw and the second guide screw respectively; a through hole is formed in each guide screw nut, each through hole is arranged horizontally and is perpendicular to the axis direction of the corresponding guide screw, a slidable rod ruler is arranged in each through hole, a fixed block is arranged at the end, far away from the base, of each rod ruler, a positioning column is arranged on each fixed block, each positioning column is perpendicular to the corresponding rode ruler and provided with a scale ruler, and each positioning column can be fixed in a locked mode through a second fastening screw which is arranged on the corresponding fixed block. By means of the device, scribing can be conducted on the core penetrating bolt, rapid installation can be carried out according to the scribing, and it can be guaranteed that the two ends, extending out of the nuts, of the core penetrating bolt are equal in length.