Considering that construction ventilation is the main factor that restricts the construction progress of underground workshop caves and affects the construction safety, it is also an important solution to the gun smoke and dust produced by the excavation surface blasting and the harmful gas discharged by the diesel engine digging and transportation equipment. Through the research and development of the construction intelligent ventilation control system, the real-time online monitoring of the ventilation environment in the hole is realized, and the intelligent automatic frequency modulation control of the fan equipment is realized. Taking a large hydropower project as an example, this paper discusses the intelligent ventilation construction of underground cave group construction, puts forward the intelligent solution suitable for this kind of project, and explores a new intelligent supervision way for similar engineering problems, which has certain reference significance.