The invention discloses an automatic leaking stoppage device for the breakage of a freezing pipe connector. The automatic leaking stoppage device comprises a sleeve and a chemical agent. The freezing pipe connector is sleeved with the sleeve, and the two ends of the sleeve and a freezing pipe are tightly sealed through tight sealing assemblies. The internal diameter of the sleeve is larger than the external diameter of the freezing pipe connector, a closed annular cavity is defined by the inner wall of the sleeve and the outer surface of the freezing pipe connector, and the chemical agent is stored in the annular cavity. In the normal use period of the freezing pipe, the chemical agent in the device is not affected by external mud, water and saline water in the pipe; and after the freezing pipe connector is broken, the chemical agent in the device is subjected to a chemical reaction after encountering the saline water, low-temperature elastic adhesive matter is generated and rapidly cured, and therefore the automatic leaking stoppage function is achieved. The device is suitable for freezing method shaft sinking and other various stratum freezing projects, automatic and rapid leaking stoppage can be carried out aiming at breakage of the freezing pipe connector, it is avoided that the saline water leaks to melt a freezing wall and even induce a mine flooding accident, and important engineering practical value is achieved.