To provide a crushed soil-selecting machine and a soil-improving device installed with the same machine, capable of crushing a construction- generated earth generated accompanying with a reclamation for a development of field and mountain, a land creation, and a construction or an engineering work (hereinafter called as the construction-generated earth), and selecting for utilizing the soil as a reclaimed soil.

This crushed soil selecting machine 2 is constituted by arranging plural rotary members in parallel, on which plural rotary blades are installed so as to cross along a shaft axis of a rotary shaft by taking an interval, actuating rotary blades of the plural rotary members, while transporting the construction-generated earth 67 from an upstream side to a downstream side, so as to crush and select the earth, and also supplying the construction-generated earth 67 from the soil crushing and selecting machine 2 with a soil improving agent R or an additive H to a kneading and mixing machine 200 for kneading and mixing them.