Install the finished shoes on the finished shoe waterproof and anti bending test machine, and use the finished shoe waterproof and anti bending test machine to drive and test the bent parts of the finished shoes at a bending angle that matches the shoe shape and a fixed speed of the bending machine. Repeat the bending process in a water tank with a certain depth of water and dye the water in the finished shoe waterproof and anti bending test machine until the finished shoes are filled with water or reach the predetermined number of turns. Evaluate the waterproof and anti-seepage performance of finished shoes under tortuous conditions by measuring the amount of water that enters the interior of the finished shoe after completing the required number of twists and turns, or the size of the water penetration area of the finished shoe after completing the specified number of twists and turns.