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1. A rapid assembly and automatic sampling drilling tool for frozen soil layer exploration, comprising a fixed flow divider, a flow guide pipe, a coring pipe and a drill bit, wherein the fixed flow divider is connected to the drill bit through the flow guide pipe and the coring pipe, the flow guide pipe and the coring pipe are mounted between the fixed flow divider and the drill bit, two ends of the flow guide pipe are in communication with the fixed flow divider and a main flow channel in the drill bit respectively, hot water in the fixed flow divider can be conveyed into the drill bit through the flow guide pipe and sprayed from a nozzle arranged on the drill bit for drilling and coring operations, an inlet of the coring pipe is in communication with a coring channel in an inner cavity in a middle of the drill bit, and a core sample drilled by the drill bit is taken out through the coring pipe, wherein the coring pipe is a plexiglass pipe, four of the flow guide pipes are provided, and the four flow guide pipes are arranged around the coring pipe, the flow guide pipes are connected to the drill bit by a quick connector, and the flow guide pipes and the drill bit can be quickly disassembled through the quick connector, and a breaker is mounted at a junction between the drill bit and the inlet of the coring pipe for breaking the core sample drilled by the drill bit.
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