Abstract: To accomplish the dual carbon goals, low-carbon or even zero-carbon development is the inevitable ap? proach for traffic tunnel engineering, and the digital transformation brings both opportunities and challenges in this regard. The intelligent infrastructure service system affords a strong digital base for low-carbon development of traffic tunnel engineering in terms of information acquisition, transmission, processing, analysis, expression and service process. The cutting-edge technologies such as big data, cloud computing, blockchain and artificial intelligence bring new momentum for comprehensive survey, dynamic design, intelligent construction and efficient O&M in traffic tunnel engineering. The research into low-carbon tunnel is still in its early stage, the relevant standard system is not established yet, the development objectives of low-carbon and zero-carbon tunnels, the object of digital empowerment and the implementation approach are still unclear, and the relevant top-level design theory needs to be further investigated. This paper offers a preliminary analysis on the carbon emission characteristics of traffic tunnel engineering, a retrospect of the digital technologies that have been successfully applied in the full life cycle of tunnel projects, and also an outlook on the prospect of digital technologies in low-carbon tunnel development. In the future,the late-mover advantage should be exploited in development of low-carbon tunnel, and the digital technologies and the green low-carbon development concept should be intensively integrated, so as to enhance the level of digitization in traffic tunnel engineering and also steadily accomplish carbon neutrality in traffic tunnel engineering industry.