The utility model provides a jacking instrument. The jacking instrument includes the base, has along the double -screw bolt and the jacking housing of the center pin of vertical orientation extension, the jacking housing is equipped with roof and the accommodation space that open side down, the double -screw bolt include with base threaded connection's screw thread section, stretch into in the accommodation space the extension section and with the screw thread section with extend the linkage segment that the section coupled together, be equipped with the rotation portion of rotatable double -screw bolt on the linkage segment, extend section direct or indirect point contact with the roof. The utility model provides a be equipped with the weighing module subassembly of above -mentioned jacking instrument. The utility model discloses a protected the roof surface not by the technological effect of fish tail when jacking instrument simple structure, convenient operation and jacking.