The invention discloses a horseshoe-shaped large-section tunnel construction method, and aims to solve the technical problem of low construction efficiency of a large-section tunnel. A horseshoe-shaped section of a tunnel is divided into at least four construction areas, wherein a construction area (1) corresponds to the arch part of the horseshoe-shaped section, the upper edge of a construction area (4) is not lower than an inverted arch and a guide table of the tunnel, a construction area (2) and a construction area (3) correspond to the middle step construction area; and the construction area (3) is not smaller than the construction area (2), long-step construction is conducted through at least three construction teams, the non-construction area is used as a material conveying channel,and therefore the transportation amount of a slag discharging vehicle is kept to be matched with the excavation square amount, and the construction efficiency of the horseshoe-shaped large-section tunnel is improved.