The invention relates to a continuous loading indentation stress corrosion tester and a test method therefor. The continuous loading indentation stress corrosion tester is used for researching hysteresis growth and related mechanical behaviors of material cracks and especially for researching rules of the influence produced by different stresses, environmental mediums and temperatures on crack nucleation and growth, and clearly expounds the rule and the mechanism of material invalidation under the stress-environment coupling condition. The test method comprises the following steps of 1, through contact between a pressure head and a test sample under a certain load, determining fracture toughness of a brittle material, and observing the influence produced by the environment on crack growth under the continuous loading condition, 2, determining threshold stress of hysteresis growth of cracks of the brittle material by radial cracks having certain length under a certain environmental condition, 3, in a solution medium, researching crack growth of a toughness material by indentation, and 4, observing a change of electrochemical parameters in crack growth by connection with an electrochemical workstation. The continuous loading indentation stress corrosion tester can be operated conveniently and simply, realize control of an experimental environment and a load, is especially suitable for long-term loading in different environments, has a simple structure, is convenient for operation and has a large application prospect.