Chemical stress corrosion stretching system for preventing sample from bubbling and strain measurement method

The invention discloses a chemical stress corrosion stretching system for preventing a sample from bubbling and a strain measurement method. The system comprises a horizontal in-situ stretching device, a PC stretching controller, a water bath box, a DIC system and a defoaming device; the horizontal in-situ stretching device comprises a base, a left half clamp, a right half clamp and a stretching driving mechanism enabling the two half clamps to move oppositely. A stretching device control interface arranged on the base is electrically connected with the PC stretching controller; the water bath box is arranged above the base, and the vertical edge parts of the inner sides of the two half clamps extend into the water bath box, so that the test piece is immersed into the corrosive liquid; a glass window is arranged on the front side wall of the water bath box; a liquid inlet hole and a liquid return hole are also formed in the side wall of the water bath box; a DIC system is arranged outside the front side wall