The invention discloses a gravity-traction horizontal measurement correcting device, which comprises tension springs, a horizontal correcting device housing, screw rods, a universal ball, positioningplates and pressure measuring boxes. The top end of the horizontal correcting device housing is connected to a device box, the upper end of which is connected to a fixed disc. An inner wall of the middle part of the horizontal correcting device housing is provided with adjusting chambers, in which the positioning plates are placed; the middle part of the positioning plates is provided with a spherical groove with the universal ball embedded; the bottom end of the universal ball is connected to a traction rod, the bottom of which is fixedly connected to a weight dropper; the top end of the universal ball is connected to a deflecting rod; a fixing sleeve is welded to the deflecting rod, and the side wall of the fixing sleeve is provided with a plurality of connection blocks at same intervals; the outsides of the connection blocks are fixedly connected to one ends of the tension springs, and the other ends of the tension springs are connected to pull rods, which are installed in the pressure measuring boxes. The correcting device is adjusted according to different values of pressure sensors till all the detection values are same. The correcting device is high in precision and has a good correcting and guiding function.