The invention discloses a tester for simulation and real-time test of a gaseous corrosion failure of a thermal barrier coating, belonging to the field of testers of high-temperature coating materials. The tester comprises a test platform, a corrosive gas loading system, a nondestructive testing system, a control system and the like, wherein the test platform is provided with a test sample clamping device and a sample chamber, the corrosive gas loading system is fixed on the test platform, and the nondestructive testing system and the control system are arranged below the test platform. The tester disclosed by the invention can be used to simulate a high-temperature corrosive service environment of the thermal barrier coating of aeroengine turbine blades, simulate a gas corrosion failure process when the coating takes service by means of controlling the type (such as H2S, SO2 and steam), pressure, corrosion temperature and other parameters of the corrosive gas, periodically detect the changes of coating impedance and damage acoustic emission signals during corrosion of the test sample through a complex impedance spectrometry system and an acoustic emission detection system, and analyze the evolution conditions of interface shapes and damages in the corrosion process of the test sample, thereby providing an important test platform for effectively evaluating the failure process and failure mechanism of the thermal barrier coating in the high-temperature gas corrosion environment.