The invention provides a gymnasium used in a plateau environment, wherein the gymnasium is formed by encircling a bottom plate, walls and a top cover; the walls are provided with a window and doors; the window is provided with a ventilation device; the walls are provided with a plurality of ventilation devices; the top cover is provided with solar panels; the walls are provided with inner layer steel plates and outer layer steel plates; cavities are arranged between the inner layer steel plates and the outer layer steel plates; the internal portions of the cavities are provided with heat insulation cotton; the doors include a single door and folding doors; the single door is hinged with one wall; locking parts are arranged on the first folding door; locking seats matched with the locking parts are arranged on the second folding door; the locking parts and matched with the locking seats to lock the first folding door with the second folding door; one end of the second folding door is hinged with the third folding door, and the other end of the third folding door is hinged with one wall; the gymnasium includes a variety of fitness equipment placed in the gymnasium; the external portion of the gymnasium is provided with an oxygen supplying device and thermal insulation cotton used in cold weather to ensure that the indoor temperature, and oxygen supplying device supplies the indoor with oxygen for use in the plateau environment.