The research and development of materials for extreme environmental service has always been a bottleneck in development of national strategies such as aerospace, and different environmental factors can affect the performance of materials. Neutrons, due to their strong penetrability and sensitivity to light elements, can complement synchrotron radiation technology. In-situ devices are used to reduce the deformation process of materials under real working conditions, and neutron probes are used to observe the evolution of lattice strain, texture, phase transition, and residual stress of materials under service conditions. Neutron spectrometers from multiple countries are equipped with different in-situ tensile devices, which enable in-situ stress loading of samples in different loading environments, testing and analyzing the microstructure of sample materials. This can solve important scientific mechanism problems in the field of materials engineering and promote the development and application of materials. This article introduces the situation of in-situ stretching devices for different neutron source spectrometers at home and abroad, focusing on the design principles and structural characteristics of multi field coupling in-situ stretching devices used in neutron diffraction technology, and highlighting the development direction of engineering materials research.