The invention provides an experimental facility for utilizing an anelastic strain recovery method for in situ analysis of an aquo-complex settled layer stress state. The experimental facility belongs to the field of natural gas hydrate exploitation, and utilizes the anelastic strain recovery method to measure the stress state of an in situ aquo-complex core, wherein the anelastic strain recovery method is characterized by using an isotropic viscoelastic model to technically analyze a three-dimension stress field of a core sample through measuring the elastic strain restored by the in situ core sample. The experimental facility comprises a strain gauge, a water bath, a heating and cooling circulator, a data recorder, a thermistor thermometer and a computer data acquisition system. The experimental facility can truly measure the structure construction and the stress state of the in situ aquo-complex core during the aquo-complex exploitation process, and plays an important guiding role in basic physical property research, exploration and safety exploitation of a natural gas aquo-complex.