Abstract: According to the 2022 China Building Energy Consumption and Carbon Emissions Research Report, the total energy consumption of the whole process of buildings in China accounts for 45.5% of the total energy consumption of the country, and the total energy consumption of both rural houses accounts for 26.8% of the total energy consumption of buildings in the country, so it is necessary for the energy-saving renovation of existing rural houses. Taking a rural house in Guanzhong area as the research object, this paper uses DeST-h software to simulate and analyze the building load of the existing farmhouse, explores the impact of energy-saving construction of the outer envelope structure on the energy consumption of the building, and proposes three energy-saving renovation schemes with high energy saving and reasonable cost through comparative analysis, and the energy-saving efficiency reaches 43.29%, 52.06% and 56.02% respectively.