Tunnel construction initial support device

The utility model discloses a tunnel construction initial support device applied to underground tunnel engineering. The tunnel construction initial support device comprises a plurality of precast steel corrugated pipe piece units, a preset number of steel corrugated pipe piece units are radially spliced into annular support structures closely fitted with excavated soil layers, and the annular support structures are longitudinally and sequentially spliced into continuously sealed support stress structures. By the aid of the tunnel construction initial support device, the construction process of initial lining structures of the underground tunnel engineering can be effectively simplified, construction time is shortened, and a 'quick closed' principle of tunnel excavation support is realized.