The invention discloses a construction method of a reserved T-shaped rock beam and rock pillar of a shallow-buried subway station with a super large section, and belongs to the technical field of tunnel construction. The construction method comprises the steps that firstly the left side rock mass and the right side rock mass of an engineering are excavated so that the section can be formed into a reserved T-shaped rock beam and rock pillar, and the side wall of the formed two-track tunnel adopts combination support of a anchor cable combined with a grouted rock bolt; secondly water-proofing construction, I-beam construction and second lining structure construction are conducted on the side wall adopting the combination support in the first step for further strengthening, and the excavation place is backfilled with earth and stone materials, filled to the full and compacted, and the surface of the excavation place is subjected to construction with C20 plain concrete; thirdly the two side areas of the T-shaped rock beam and rock pillar are excavated; fourthly the top area of the T-shaped rock beam and rock pillar is excavated at piecewise intervals; fifthly the middle area of the T-shaped rock beam and rock pillar is excavated, and the backfill earth and stone materials are cleared away. According to the scheme of the reserved T-shaped rock beam and rock pillar, the method is suitable for construction of the shallow-buried subway station or a tunnel with the super large section, and can effectively control surrounding rock stress, the settling volume of arch parts of the tunnel and deformations of the two sides of the tunnel, protect surface buildings and guarantee construction safety.