The utility model provides an anti -deformation volume detects with loose chi, including three straight section, straight section goes up has seted up long strip -shaped sliding groove along the body, connect through the pivot between the adjacent straight section, the pivot is become by axle sleeve and round pin major structure, and the axle sleeve passes long strip -shaped sliding groove, and the round pin axle is screwed in the axle sleeve, wherein rotates in two arbitrary adjacent pivots and is connected with the scale. The utility model discloses anti -deformation volume detects with loose chi simple structure, make simple, with low costs. Can regard as multiple measuring tool to use at the shipbuilding in -process, avoid constructor to carry multiform measuring tool simultaneously, the constructor of being convenient for carries, conveniently has the structrual installation precision of angle to segment tongue -and -groove anti -deformation quality with improving, possesses high industrial value.