The invention discloses an indoor large overhanging type wooden boat structure. The indoor large overhanging type wooden boat structure comprises a plurality of first arc keel units, a plurality of second keel units, a plurality of hanging rod units and a plurality of plate units. The first keel units are arranged at intervals. The second keel units are transversely arranged at intervals, and the second keel units and the first keel units are arranged in a crossed manner and fixedly connected at intersections. The hanging rod units are vertically arranged at intervals, meanwhile, the bottom ends of the hanging rod units are fixedly connected with the first keel units, and the top ends of the hanging rod units are fixedly connected with connecting pieces fixedly arranged on a civil engineering structure. The plate units are detachably installed in a plurality of spaces defined by the first keel units and the second keel units. The invention further discloses an installing method of the indoor large overhanging type wooden boat structure. Compared with the prior art, the problems of structural precision, installing firmness and floor bearing can be effectively solved.