Underground construction freezing waterproof system capable of being used in city

The utility model relates to the technical field of waterproofing of tunnels, footrills or other underground caverns, and discloses an underground construction freezing waterproof system capable of being used in cities, which adopts a freezing device to freeze water-containing soil into a frozen soil curtain to block seepage of underground water. According to the device, the part, higher than the underground water level line, of the multi-layer underground building is firstly excavated on the premise that precipitation is not carried out, and then the freezing device is suspended underground, so that the device does not need to be demolished on the ground, noise generated in the freezing process cannot affect the ground, the length of a frozen saline water pipe is shortened, and the loss of cooling capacity is reduced. The refrigerating unit is arranged on the floor of the underground floor and is separated from the frozen stratum, so that the refrigerating unit is prevented from shaking due to the volume cha