Strength testing device

The invention provides a strength testing device including a base and a cylinder body arranged on the base. A cavity is arranged inside the cylinder body; an adjusting screw rod, a compression sleeve, a thrust rod, and a cam are successively arranged in the cavity along the axial direction of the cylinder body; the adjusting screw rod penetrates through the cylinder body and extends into the cavity; the compression sleeve sleeves one end of the thrust rod; a blocking part is arranged in the compression sleeve; the extending-in end of the adjusting screw rod abuts against the blocking part; under the driving of the adjusting screw rod, the compression sleeve can horizontally slide on the thrust rod; the other end of the thrust rod is provided a position-specified boss which is integrated with the thrust rod; a spring is arranged between the compression sleeve and the thrust rod; the spring is sleeved with the thrust rod; the two ends of the spring respectively abut against the compression sleeve and the position-specified boss; the cam is arranged on the axis of the cylinder body and is elliptical in shap; the distance from the shaft hole to the position-specified boss is equal to the length of the semi-minor axis of the cam; and the strength testing device is further provided with a transmission shaft which is vertical to the axis of the cylinder body, penetrates through the cylinder body, and has one end fixed to the cam.