The invention discloses a station foundation trench earthwork excavation method. The foundation trench earthwork excavation principle is that upper and lower layering excavation is carried out in thevertical direction according to the design position of a steel support, and erecting is carried out in real time when each layer is excavated to the position below the bottom level of the steel support by 50 cm; excavation from one end of a station to the other end of the station is totally adopted, implementation according to steps is carried out, structural construction is instantly started after earthwork excavation is completed by a lining unit distance, the exposing time of soil bodies on the two sides is shortened, and the anchoring shotcreting and steel support circulated beat can be accelerated; station earthwork excavation adopts the construction methods of vertical layering, longitudinal subsection, middle groove pulling and transverse edge expanding; and vertical layering, longitudinal partitioning, dual-way advancing, excavation after supporting, supporting circulation and concentrated pumping are carried out, excavation is carried out in two steps, the surface layer soil body is excavated by about 2 m in the first step, and the remaining soil layer is excavated in the second step, and five layers of steps are formed. The method is simple in step, reasonable in design,convenient to construct, high in construction schedule, good in construction effect and low in input construction cost.