Vacuum stretching cold and hot stage capable of fully automatically replacing sample and testing method

The invention relates to a vacuum stretching cold and hot stage capable of fully automatically replacing a sample and a testing method. Belongs to the field of material mechanical property testing. Comprising a right side first replacement module, a left side first replacement module, a first stretching module, a second stretching module, a third stretching module, a left side second replacement module, a right side second replacement module, a temperature changing module with a sensor, a temperature changing module without a sensor and an outer cavity part. The device has the advantages that the device is novel and compact in structure and simple to control, full-automatic quick replacement can be realized under the condition that a sample is difficult to replace or needs to be fixed by various clamps, so that the test time is saved, the device has relatively high practicability, a technical means is provided for enhancing the problem that the sample is difficult to replace by a conventional stretching cold