Holes and caves for different purposes such as waste motor-pumped well, mines, exploratory wells, building foundation pile holes, draining deep wells and the like are formed in our living environment. Occasionally people or objects fall into these holes and caves for various reasons. These wells and holes, which have small diameter and poor air ventilation or event contain poisonous gases, make the rescue operation by the rescuers very dangerous and difficult, and even prevent the rescuers from entering for the space is too narrow. The invention provides a special small-diameter deep well rescuing device suitable for use in field, which has a compact structure, can be detached and installed conveniently, has functions of supporting by a supporting plat, protecting by holding tightly with protective plates, imaging for observation, lighting, communicating by voice, ventilating by hose and adopting drive by a direct current motor, and can prevent the rescuers from going into deep wells and help to implement quick and effective rescue of a trapped object at the same time.