The invention belongs to the technical field of test tools, and discloses a storage stack test tool and a test method thereof. The test tool comprises a reference unit arranged beside a stack, and a servo unit arranged above the reference unit and reflecting the displacement of an article at the uppermost layer of the stack. The servo unit simulates the displacement of the article at the uppermost layer of the stack, the offset amount of the servo unit relative to the reference unit after storage ends is measured to obtain the horizontal offset amount and the height decrease amount generated in the storage process of the stack, and the height of the stack is combined to further obtain the deflection angle of the stack, so further improvement of packaging design of articles is facilitated. The storage stack test method has the advantages of simple structure of a test device, low cost, small influences on the stack, simple operation of the test process, and high accuracy and authenticity of obtained parameters, is of great reference significance to assess whether the packaging protection design of the articles is reasonable or not, and makes the design scheme be conveniently and timely adjusted.