Ring stiffness testing machine and test method thereof

The invention discloses a ring stiffness testing machine and a testing method thereof. The ring stiffness testing machine comprises a computer host and a machine frame. The machine frame is provided with a base. The machine frame is vertically and slidably connected with a pressing plate, and the machine frame is provided with a driving mechanism for driving the pressing plate to be lifted and lowered. The machine frame is provided with a vertical shaft, an indicator member is slidably connected to the vertical shaft, and the indicator member is provided with a locking member for limiting thesliding of the indicator member. A convex block is convexly arranged at the top of the locking member, and a limiting block which is blocked by the convex block is convexly arranged on the side edge of the pressing plate. The distance from the lower surface of the limiting block to the lower surface of the pressing plate is equal to the height of the convex block, so that after a pipe to be testedis placed on the base, th