The invention discloses a construction method for a tunnel on a landslide section. The construction method for the tunnel on the landslide section comprises the steps that hole drilling is carried out on an inverted arch for supporting in the preliminary stage of construction, and drilled holes are arranged in an array mode; reinforcing piles which are perpendicular to landslide surfaces at cave bottoms are installed in the drilled holes respectively. Due to the fact that simple landslide control is carried out in a cave, the bearing capacity of the tunnel is improved, the purpose that landslides are controlled inside the tunnel is achieved, the technology is simple, and economy and rapidness are achieved.