This machine can be used to test the dynamic waterproof performance of various finished boots and shoes. The shoes are installed on a tester, and a certain depth of water is placed in the water tank to contact the shoes. The tester pushes the forefoot of the shoes to bend at a certain angle and frequency, simulating the walking state of human feet in water. The water permeability time and bending number required for water to penetrate from the outside of the shoes into the shoes are measured, or the water permeability inside the shoes is measured at a specified time or bending number