The utility model discloses a to freezing device that pit shaft concrete ectonexine wall of a well carries out steam maintenance, including a steam maintenance section of thick bamboo and steam generator, form airtight maintenance space between a steam maintenance section of thick bamboo and the wall of a well, install delivery duct on steam generator's the steam outlet, delivery duct pass through the steam air flue with airtight maintenance space fluid switches on, the utility model discloses a steam generator produces steam, all can add gentle humidification maintenance to freezing the pit shaft concrete ectonexine wall of a well, guarantees to freeze the temperature and the humidity of the pit shaft concrete ectonexine wall of a well, adopt the circle of aerifing of rubber material, can guarantee the leakproofness between curing means and the pit shaft wall of a well, aerify circle be provided with with the pit shaft in the compressedair line way be connected fill air nozzle, need not connect the gas ducting on purpose, sparingly the resource, temperature and humidity sensor is set up in the maintenance space, the inside humiture in maintenance space can be in time detected.