The invention discloses an intelligent detection system for building energy consumption, which is characterized in that: the system is composed of two parts: a building energy consumption parameter collection platform based on a wireless sensor network and a building energy consumption level classification system, and is based on a wireless sensor network The building energy consumption parameter acquisition platform realizes the detection and monitoring of the environmental parameters affecting the building. The building energy consumption level classification system consists of a temperature detection module, an illuminance detection module, a humidity detection module, an energy consumption prediction module and an interval number kohonen neural network building Composition of material energy consumption state classifiers; the present invention effectively solves the characteristics of existing building energy consumption that is not changed according to building environmental factors, such as nonlinearity, large lag, and complex changes affecting building energy consumption, and intelligently monitors building energy consumption. This will greatly affect the accuracy of building detection.