Building energy consumption prediction method and system based on big data

The invention discloses a building energy consumption prediction method and system based on big data, and relates to the field of building energy consumption monitoring. The method comprises the steps: obtaining the current energy consumption reference data and historical energy consumption sample data of a to-be-detected building; determining target energy consumption data close to the energy consumption reference data from the energy consumption sample data based on the energy consumption trend between the target energy consumption data and the energy consumption reference data and a presetrule; determining a second candidate energy consumption item set composed of candidate energy consumption items closer to the energy consumption reference data from the target energy consumption databased on the relationship between the respective energy consumption trends of the target energy consumption data and the energy consumption reference data; and finally predicting an energy consumptionresult based on the second