Waterproof device for deep foundation pit in rail transit construction

The invention relates to the technical field of building equipment, and discloses a rail transit construction deep foundation pit waterproof device which comprises a protection mechanism, an upward jacking mechanism is installed on the upper side of the protection mechanism, a wetting mechanism is arranged at the lower end of the upward jacking mechanism, an adjusting mechanism is installed on the left side of the protection mechanism, and a water inlet connecting pipe is installed on the left side of the adjusting mechanism. Clean water is conveyed to the multiple protection mechanisms through the water inlet connecting pipe, water is supplemented to the pile head in the protection mechanisms, and therefore manual operation is liberated, and water is rapidly and conveniently supplemented to the pile head; continuous water supply maintenance is carried out on the pile head through the humidifying unit, so that water flow acts on the pile head, water flow permeation and dispersion time is given, and the situat