An embodiment of the invention provides a desorption test device and a test method. The device comprises a desorption device for carrying out desorption on a sample to be tested; a gas discharge device for discharging the gas desorbed by the desorption device; a water draining and gas collection device for collecting the gas discharged by the gas discharge device; a gas export device for exportingthe gas collected by the water draining and gas collection device; and a gas sample collection device for collecting the gas exported by the gas export device, wherein the gas discharge device is inplugging connection with the desorption device; the water draining and gas collection device is connected with the gas discharge device; the gas export device is connected with the water draining andgas collection device; and the gas sample collection device is in plugging connection with the gas export device. The desorption test device provides equipment support for efficient obtaining of the desorption gas, and desorption test can be carried out efficiently through the desorption test device.