The main purpose of this study is to design the test device and specimen to develop test-method for waterproof and crack performance under hydraulic pressure condition. The test device is manufactured to simulate the behavior of the structures under the pressure change. This condition was intended to simulate the representative behavior of underground structure. As a result of performance test, the test device and specimen showed good waterproofing and crack simulation of underground-structure under various hydraulic pressure condition. Test results showed the difference in accordance with waterproofing material characteristics. Therefore test device and method for Waterproofing Material under Hydraulic Pressure Environment can supplement the traditional test methods.