The invention relates to a station internal blasting construction method for underground excavating a subway station. The station internal blasting construction method comprises the following steps that earth in the station is divided into an upper earth and a lower earth, and the upper earth and the lower earth are correspondingly divided into a plurality of layers in the vertical direction; eachearth layer in the upper earth is excavated by vertical eye blasting in sequence; after the upper earth blasting is completed, a middle plate of a main structure is applied so that the bottom of theplate is 1.5-2 meters higher than the upper surface layer of the lower earth below the middle plate; and the uppermost earth layer in the lower earth is blasted by horizontal eye blasting and the other earth layers are excavated by vertical eye blasting in sequence, after blasting, follow-up station construction operations can be completed according to conventional methods. The station internal blasting construction method integrates the open and underground excavating and blasting construction technology, layered and segmented blasting is carried out on the earth in the station, and a corresponding blasting mode is adopted for different positions, the construction safety is ensured, time and labor are saved, the construction efficiency is greatly improved, and the influence of blasting construction on a finished product structure is effectively controlled. The station internal blasting construction method is suitable for foundation pit excavation construction with rock layers, reverseconstruction of station structures and tight construction period.