The invention discloses a measuring device and a method for corrosion behaviors of active metal surfaces, and aims to solve the problem that the thickness and the roughness of samples are relatively high when active metals such as the lanthanide series and the actinide series are measured by adopting a PVT (Process Verification Test) method. According to the measuring device and method for corrosion behaviors of active metal surfaces, only a certain surface of the active metal sample is in contact with corrosive gas by adopting indium wires to seal off other surfaces of samples, and then corrosion assessments such as hydrogenation, oxidation, and the like of active metal surfaces are carried out. Compared with the prior art, the measuring device and method for corrosion behaviors of activemetal surfaces can realize the corrosion assessments of water vapor, hydrogen, and oxygen, and can only examine a local area of the surface, and eliminate influences of other surfaces and edge defects. Meanwhile, the measuring device and method for corrosion behaviors of active metal surfaces also have the advantages that the thickness of the sample can be thinner, and the pressure borne by the sample can be larger; the requirement on the surface roughness of the sample is relatively low, and general machined samples can meet the requirements; and temperature unevenness can be effectively avoided. In addition, the measuring device can judge the degree of corrosion reaction, and automatically terminate the reaction based on the improvement of the structure.