To provide a soil grain recovery circulation system for use in boring work, capable of accumulating soil grains from turbid water produced in boring work while recycling the remaining water for the boring work to reduce burdens on the environment, simple in constitution and carried to and constructed even in a place with bad transport conditions.

The soil grain recovery circulation system for boring work has a boring device A boring a hole while supplying a bored place with recovery water in which a coagulant with soil grain recovery property is dissolved; a precipitator D into which mixed turbid water of recovery water and soil grains 3 discharged during boring of the boring device A, is led; a water storage tank E into which recovery water which is supernatant of the turbid water led into the precipitator D, is led; and a water supply device P for supplying the recovery water in the water storage tank E to the bored place or the boring device A.