Based on the influence of ultrasonic vibration on the adsorption/desorption and seepage characteristics of coalbed gas, a test system for the measurement of adsorption and seepage characteristics of coalbed gas was designed. The main component of the system is a pressure testing device. The test system consists of six parts, including an intelligentized acoustic generator, adsorption and seepage devices, a pressure supply, a deformation measurement component, a gas supply and a deformation tester. The function and operating method of the test system were introduced in detail. Experimental results show that the test system can meet completely the requirements for the characterization of adsorption/desorption and seepage of coalbed gas in either the presence or absence of an ultrasonic field.