The utility model discloses a seepage test system, including the seepage test device that is provided with the water inlet, still include the supply tank and be used for the regulation the supply tank is relative the high adjusting device of water inlet height, the apopore of supply tank lower extreme with the water inlet leads to the pipe intercommunication. In this seepage test system because utilize fluid pressure with apart from the relation between the vertical distance of liquid level, and then can be through the height of regulation supply tank to adjusting the height of the relative water inlet of supply tank liquid level, realizing the pressure adjustment to the water inlet, because be linear relation, the degree of regulation is mastered easily moreover, and feasible regulation is more convenient, so the free problem of adjusting of the pressure water that this seepage test system can solve seepage test device water inlet department effectively.