With the increasing proportion of value-added services in metropolitan areas and the diminishing marginal effect of energy saving and carbon reduction in the primary and secondary service industries, service industry has become a new field of energy saving and carbon reduction. Based on the CO2 emissions coefficient and the accounting methods of energy consumption recommended by IPCC in the Guidelines for National Green Gas Inventories, a calculation has been made of the overall energy consumption and CO2 emissions of the service industry in Beijing from the year 1995 to 2014, followed by an analysis of the overall change trend and the change of energy structure, along with a calculation of the complete CO2 emission intensity by using Beijing’s comparable price input and output data between 2007 and 2012. By using Logarithmic Mean Divisia Index (LMDI) identification and decomposition, a study has been conducted on the key factors affecting CO2 emissions of Beijing’s service industry from the year 2005 to 2014 years as well as their contribution rates. The results show that the energy consumption carbon emission of service industry is increasing year by year, and the growth rate of energy consumption is faster than energy consumption. The energy intensity of service industry and the direct discharge intensity of energy consumption are decreasing synchronously. The energy consumption of the service industry is dominated by petroleum. The proportion of coal consumption is decreasing year by year, and the energy consumption structure presents an upward trend characterized with rationalization and low coal production. The final requirement for the service industry is declining year by year, and the proportion of indirect CO2 emission intensity of service in most of the service industry shows an obviously decreasing trend. The industrial scale and population size are the main factors that lead to the direct carbon emission growth of the service industry, while the energy intensity is the curbing factor of the direct increase in the energy consumption of the service industry.