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For the problem of huge electrical energy waste in the corporate buildings, the enterprise building energy-saving control system, was designed based on STM32F. Infrared sensor module was used in this system to count the number of people in buildings, while the light control module is applied to collect the light intensity. The people number and light intensity signal were real-time collected by the microprocessor, and data process and algorithm analyses were proceed. Then the system was used to control the automatic switch of the building lighting lamps. And that is also applied to collect the working condition of the electrical appliances to determine whether it has been in the standby state for a long time. If yes, then the system will cut off the power supply automatically. The experimental results show that the building energy-saving control system has improved energy efficiency, which realizes the low-carbon energy.