In-situ multi-axis creep fatigue testing device

The invention relates to creep fatigue testing, and discloses an in-situ multi-axis creep fatigue testing device which can effectively improve the reliability, the accuracy and the normalization of a test experiment. The device comprises a heating furnace, a pressurizing pipeline assembly comprising a pressurizing pipeline and a medium conveying system, the heating furnace comprises a plurality of observation windows arranged in the axial direction and the radial direction of the tubular sample; a first end of the pressurizing pipeline is connected with the tubular sample and is arranged in the heating furnace, a second end of the pressurizing pipeline is arranged outside the heating furnace, and the second end is provided with an inlet and an outlet; the medium conveying system comprises a conveying pipeline, a medium storage container, a compressor, a pressure controller and an electromagnetic valve, the medium storage container, the compressor, the pressure controller and the electromagnetic valve are sequ