The utility model provides the utility model discloses an automatic the cast aluminium flange shearing force testing machine who detects, including frame, loading dynamometer and automatic control system, its technical essential is: through control motor drive lead screw drive, reduce the top board, make the accurate pressure of top board on the quilt flange of surveying, or promotion top board to position of rest to change the flange, through the control motor, appointed position is sent to the dolly that will load force cell sensor, through control hydraulic pressure station, the 830KN that progressively exerts pressure, automatic shutdown pressurization when treating that pressure reaches setting value 830KN. In the operation, realized technological problem such as automatic loading, dynamometry and loading and unloading, it is equitable to have a structural design, and loading and unloading are easy, convenient operation, it is accurate to detect, saves time, laborsaving low in labor strength, advantages such as detection efficiency height.