Shield underground butt joint liquid nitrogen rapid freezing emergency rescue device and implementation method

The invention provides a shield in-ground butt joint liquid nitrogen quick freezing emergency rescue device, relates to the field of shield tunneling, reduces construction preparation time and achieves quick water sealing and leaking stoppage, and comprises a freezing tool, and one side of the freezing tool is connected with a liquid nitrogen tank through a liquid supply pipe; a pressure control valve is arranged at an outlet of the liquid nitrogen tank to control liquid nitrogen pressure at the outlet of the liquid nitrogen tank and keep the liquid nitrogen pressure constant, the other side of the freezing tool is connected with an exhaust pipe and installed in a closed exhaust pipeline, and the freezing tool comprises a first freezing tool body and a second freezing tool body. The first freezing tool and the second freezing tool share an external sleeve, the first freezing tool further comprises a liquid nitrogen inlet and direct exhaust part, the second freezing tool further comprises a liquid nitrogen inl