The invention relates to an unreal engine technology-based home decoration system. The system comprises a house type management module, a material library, a light setting module, a roasting module, an effect filter module, a webpage setting module and a visual angle display module, wherein the house type management module is used for importing user type planes to generate three-dimensional application models and carrying out change, adjustment, movement and rotation operations on product models; the material library comprises a preset material library, preset products and self-selected materials; the light setting module comprises an automatic light setting function and is capable of simulating natural lights, simulating the outdoor environment effects and adjusting various light effects; the baking module comprises a cloud processing function and a local rendering function; the effect filter module comprises a preset filter library, an effect simulation unit, a sound simulation unit and a scene presetting unit; the webpage setting module is connected with a third-party webpage; and the visual angle display module comprises a roaming setting unit and a rendering drawing unit. Through the system, different decoration effects can be changed through one key, and the home decoration can be easily finished.