Freezing sampling device for urban unconsolidated formation

The invention discloses a freezing sampling device for an urban unconsolidated formation, and relates to the field of geological prospecting sampling equipment. The freezing sampling device comprisesan outer pipe. A drill bit is arranged at one end of the outer pipe, a core barrel communicated with the drill bit is arranged in the outer pipe, and a freezing mechanism is arranged in the outer pipeand used for freezing the end, close to the drill bit, of the core barrel. A flushing fluid inlet channel is formed in the end, deviating from the drill bit, of the outer pipe, a water flow channel communicated with the flushing fluid inlet channel is formed between the outer pipe and the core barrel, and a drainage channel communicated with the water flow channel is formed in the drill bit. Thefreezing sampling device for the urban unconsolidated formation has the following advantages and effects that the freezing mechanism is additionally arranged to freeze the core in the core barrel, theloose core is sealed in the