The invention provides a concrete steam curing method in subway construction, which comprises the following steps: after concrete pouring of a station main body structure is completed, constructing acuring tarpaulin, performing standing treatment for 3-5 hours, and carrying out heating steam curing at a heating rate of 15 DEG C/h or below; increasing the temperature to 45 DEG C, and performing constant-temperature steam curing for more than 6 hours; and then cooling the concrete at the cooling speed not larger than 10 DEG C/h, wherein the temperature difference between the surface of the station body structure and the environment is below 15 DEG C. According to the method, by adjusting the construction process, the phenomena of concrete peeling and cracking are effectively reduced, and the appearance quality of concrete steam curing is improved; meanwhile, when the method is adopted for concrete steam curing, the curing work efficiency can be improved, the cost can be reduced, later maintenance can be omitted, waste of manpower and materials can be avoided, meanwhile, the construction progress can be accelerated, and the cost can be saved.