The utility model discloses an indoor independent gantry structure which comprises at least two gantry column units. The gantry column units form a gantry, each gantry column unit comprises upright columns (1), upper steel plates (2), upper triangular diagonal bracings (3), a lower steel plate (4) and lower triangular diagonal bracings (5), the upper steel plates (2) are fixed to the upper side of a structural floor (7), the lower steel plates (4) are fixed to the lower side of the structural floor (7), the upright columns (1) sequentially penetrate through the upper steel plates (2), the structural floor (7) and the lower steel plates (4), the reinforcing upper triangular diagonal bracings (3) are arranged among the upright columns (1) and the upper steel plates (2), and the reinforcing lower triangular diagonal bracings (5) are arranged among the upright columns (1) and the lower steel plates (4). The indoor independent gantry structure has the advantages that problems of yielding and breaking of a floor due to excessively high gravity of an existing gantry and problems of shaking and potential accidents in aspects of the safety and the quality due to excessively high fixing elevation and excessively large fixing area of the existing gantry are solved, the later-stage maintenance cost is lowered, and a decorative effect is improved.