With the rapid development of social life and digital technology, the living environment and quality of human beings are improving. Nowadays, indoor living environments need to update their design concepts and utilize new digital technologies to improve the experience that living spaces bring to people. Virtual reality technology has a wide range of applications in this field, solving the problem of immersive experience in a given space and allowing the user to change the image of the interior of the house in time before designing it. This new technology has a great impact on the interior design industry and even on the architectural design industry as a whole. In this paper, we propose the use of the Unreal Engine in conjunction with an SDK plugin to perform simulations of interior reality, thus greatly increasing the immersive experience and design involvement of the occupants.