【Purpose/significance】Under the environment of big data, the construction of competitive intelligence system for tourism enterprises can enable tourism enterprises to forecast and monitor the market competition environment and competitors, timely understand the needs of customers and the development trend of tourism market, which is of great significance to improve the core competitiveness of tourism enterprises.【Method/process】This paper discusses the changing trend of the competitive intelligence system of tourism enterprises under the big data environment, puts forward the problems existing in the competitive intelligence work, analyses the functional requirements and construction principles of the competitive intelligence system of tourism enterprises, and on this basis, the construction framework of the competitive intelligence system of tourism enterprises is proposed, and the operation mechanism of the competitive intelligence system of tourism enterprises is expounded.【Result/conclusion】The construction of competitive intelligence system for tourism enterprises under the environment of big data provides a channel for tourism enterprises to collect, store, analyze and process information, and plays a very good guiding role for tourism enterprises to participate in market competition.