The invention, which belongs to the data processing technology, discloses a method for constructing a big data platform of government affairs. The method comprises; step one, carrying out an information resource catalog carding analysis: to be specific, carrying out information carding and a relevance analysis of information to form an information resource directory and information demanding and sharing; step two, carrying out government affair big data collection and integration; to be specific, according to the information resource directory, carrying out collection and integration of data resources to form a government affair big data set; step three, carrying out sharing and exchanging of government affair big data; to be specific, carrying out exchanging and sharing between government affair big data; and step four, carrying out an application service of the government affair big data; to be specific, building an application model, digging effective information, and pushing the effective information on needs. The method has the following advantages: government affair data can be dug, analyzed, integrated, and applied effectively and thus integration of electronic information and geographic information technologies can be realized, so that promotion and application of the smart city concept can be realized.