The invention discloses a low-temperature stress corrosion experimental device, which relates to the technical field of stress corrosion. The device comprises an environmental simulation box, a sampleloading module and a low-temperature circulation box; the environmental simulation box is located above the low-temperature circulation box, a first opening is arranged on the bottom surface of the environmental simulation box, a second opening is arranged on the top surface of the low-temperature circulation box, the position of the first opening corresponds to the position of the second opening, the upper part of the sample loading module is located in the environmental simulation box, the lower part of the sample loading module is located in the low-temperature circulation box, a sample installation groove is arranged on the sample loading module, the upper part of the sample installation groove is communicated with the environmental simulation box, the lower part of the sample installation groove is communicated with the low-temperature circulation box, the sample installation groove is used for installing samples, a corrosive medium circulates in the environmental simulation box,and a low-temperature medium circulates in the low-temperature circulation box. The device can realize the low-temperature stress corrosion evaluation of the samples under various environmental states, make up for the limitations of experiments in a single environment and create an experimental environment closer to the actual environmental state.