The invention discloses a gauge device for a torsion beam welding structure. The gauge device comprises a base. Height-adjustable supports are symmetrically arranged on the upper surface of the base; longitudinal sliding rails are arranged on the upper ends of the height-adjustable supports; transverse sliding rails are slidably arranged at intervals between the longitudinal sliding rails; sliding blocks corresponding to four positioning holes in the lower end surface of a torsion beam are arranged on the transverse sliding rails at intervals; and the upper end of each sliding block is provided with a pressure sensor. According to the gauge device, the position and height can be adjusted, and result can be read directly, thereby providing very convenient condition for detection of the torsion beam; the gauge device is improved a lot in time and cost compared with a convention gauge, is good in universality, and can be applied to common stamping welding pieces only by determining 4 planar points; errors due to human factors can be prevented, and detection precision is improved; and the gauge device is simple to operate, obvious in effect and low in cost.