The invention provides an office building lighting energy consumption splitting system and an office building lighting energy consumption splitting method. the office building lighting energy consumption splitting system comprises a processor, a mobile control terminal, and a power measurement module, a heat metering module, a power measurement module, a current measurement module, a voltage difference measurement module, a brightness measurement module, a data processing module, a database, a timer, a counter, a status display, and a wireless communication interface connected with the processor, wherein the mobile control terminal and the processor perform data transmission through the wireless communication interface. According to the office building lighting energy consumption splitting system and the office building lighting energy consumption splitting method of the invention, through arranging multiple acquisition modules, various energy consumption amounts of the lighting device can be acquired more comprehensively, various power consumption of the lighting device can be obtained more intuitively through processing on various precise data, the values of various power consumption can be transmitted to the remote terminal, measurement and use are more convenient, the structure is simple, the use is convenient, and the practicability is strong.