The invention relates to a zoom type institution of testing mini type twisted bar rigidity, it includes test desk base, column, cross arm, the characteristic is that the cross arm cover the outer of column, the inferior extremity face touch the rise fall nut on the column, and setting the locknut on the lateral surface; setting the motion joint sleeve on the front cross arm, and locking the location by locknut, removing the suspension torque detector under the joint sleeve, the transducer gaging spindle of the torque detector connect with tested torsion lever by coupling, locking and fixing the inferior extremity of tested torsion lever by self centering collet; fixing and connecting self centering collet with coupling flange,shear lever and electric control gear table, the electric control gear table is on the adjustable base of self centering collet, the adjustable base laying on the test desk base, fixing the adjusting screw of side face of adjustable base. It can solve the low efficiency and stability of the in existence static testing equipment, the technology problem of loading difficulty, the structure of institution is simple,convenience operation, it can realize high performance,high accuracy testing of torsion lever rigidity.