The traditional budget quota pricing model seems incompatible with the continuous development of the market economy. Low degree of visualization, extensive resource management, difficulty in collecting construction data, lagging control work, and separation of cost control from project management have become the main problems of current construction project cost control. This paper combines data mining technology to improve the project cost on-site verification network system, build a project cost verification system that can be used for on-site verification, and build a cost information platform. Moreover, this paper makes full use of computer information technology and uses the local area network and network as the basis to transform the vertical transmission of cost information into horizontal, so as to ensure the effective communication and exchange of cost information. According to the analysis of the case study, it can be seen that the project cost field verification method based on data mining proposed in this paper is very effective, and the system proposed in this paper can be used in actual projects.

In order to improve the effect of engineering cost accounting, this paper applies the Internet of Things technology to the engineering cost accounting system, and combines the chaotic data processing method with the Internet of Things technology. Moreover, this paper uses the Internet of Things technology to construct the engineering cost accounting system, uses the Internet of Things technology to collect various data in the real-time process of the project, and builds the engineering cost accounting system based on the actual situation. In addition, this paper combines improved intelligent algorithms to improve system performance to enable the system to collect data, manage data, process data, transmit data, and output data. It can be seen from the research results that the project cost evaluation system constructed in this paper is rated above good, which is higher than the existing project cost evaluation methods.The experimental research shows that the project cost accounting system based on the Internet of Things technology proposed in this paper has a good engineering data processing effect.