The squirting and drilling system consists of a cutting fluid supply device, a drill bit 2, a guiding device 1, an outer drill rod 3, an inner drill rod 4 and a coupling 5 (Fig. 1). After the cutting fluid Q enters the coupling 5, a part of the cutting fluid ( About 1/3Q) is sprayed through the nozzle on the inner tube to the inner tube inner passage to produce a squirting effect, causing a negative pressure in a portion of the front portion of the inner tube passage, thereby generating a large suction force. Another part of the cutting fluid (about 2/3Q)
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