In order to realize the interconnection of heterogeneous data in power engineering project bidding and ensure the fairness and objectivity of bidding and bidding, machine to machine channel (M2M) and open database connectivity (ODBC) technology based on the Internet of Things are adopted. An intelligent integrated bid evaluation system based on heterogeneous database is developed. Based on the three-layer architecture system of perception layer, network layer and application layer, the system completes the bidding processing operation and the whole process monitoring of people, objects and materials respectively through heterogeneous terminal data acquisition equipment/system and intelligent management and control system. ODBC technology is used to realize the interconnection of heterogeneous databases, and M2M technology is used to provide interfaces supporting a variety of communication protocols, so as to carry out the cooperation of associated business systems and the processing, processing and transformation of data. The practical application shows that the intelligent integrated bid evaluation platform can realize the intelligent and automatic operation in the bidding procedure and the supervision of the whole process of bid evaluation.