The invention belongs to the technical field of cost analysis of building engineering, Disclosed are an analyzer for construction cost and a control method thereof. The analyzer for construction costcomprises a data acquisition module, a data extraction integration module, a main control module, a cost list classification module, a data analysis and processing module, a power network cost analysis module, an audit module, a data conversion demonstration module and a data application sharing module, wherein, the analyzer comprises a data acquisition module, a data extraction integration module, a main control module, a cost list classification module, a data analysis processing module, a power network cost analysis module, an audit module, a data conversion demonstration module and a dataapplication sharing module. The cost list classification module of the invention is convenient to summarize the existing problems in an all-round way, and prevents frequent changing rules and adding new constraints to the original rules in actual operation, thereby saving time and labor. At the same time, through the cost analysis module of power network to solve the heterogeneity of big data of different business, truly realize the information intercommunication of big data system, comprehensive and efficient operation; In addition, the audit module can ensure the audit quality and reliability by auditing data, auditing and audit results table confirmation and other components of the multi-node multi-dimensional audit process.