Construction device and construction method for spraying concrete with mold

The invention belongs to the technical field of tunnel concrete construction, and particularly relates to a construction device and method for spraying concrete with a formwork. The construction device comprises I-shaped steel arch frames welded to a tunnel face and formwork units attached to the two adjacent I-shaped steel arch frames; the threaded straight rod clamped to the inner side of one I-shaped steel arch frame is matched with the bent clamping assembly clamped to the outer side of the other I-shaped steel arch frame, the single formwork can be attached to the inner arc faces of the two I-shaped steel arch frames, and when concrete is sprayed and poured between the single formwork and the tunnel face, the single formwork cannot be separated from the two I-shaped steel arch frames under stress; meanwhile, after concrete is initially set, the bent clamping assemblies can be separated from the outer side of the other I-shaped steel arch frame and slide outwards to be away from the other I-shaped steel a