The invention relates to an indoor thermal comfort detection system. According to the system, high-precision sensors are used for acquiring the air velocity, air temperature, air humidity and mean radiation temperature, and indoor thermal comfort evaluation is performed by selecting an appropriate metabolic rate and a clothing thermal resistance value and comprehensively considering a variety of environmental parameters. The system comprises an information acquisition module, an information core module, a communication module, an information processing module and a piece of information analysis software, wherein the information acquisition module includes the high-precision sensors. The precision of signal acquisition is high, the speed is high, and the extension function is strong; wireless communication is adopted, the power consumption is low, and the mobility is high; and a principal computer has a clear interface and is high in operability, storage is easy, and the principal computer software is a piece of green software.