The utility model relates to a plant roots collection system, its structure includes: large pore sieve and little hole sizer are placed to flourishing water containing ware in the flourishing water containing ware, large pore sieve lies in aperture plus sieve side, adopt the activity hinge joint mode to connect, still be equipped with water inlet and delivery port on the flourishing water containing ware lateral wall, the position of water inlet is less than the delivery port, aperture minus sieve side is equipped with the bracing piece, and the bracing piece inserts in the aperture of carousel to realize that large pore sieve and little hole sizer are along with the carousel rotates, flourishing water containing ware below still is equipped with the motor case, and the motor incasement isequipped with the motor, the bearing of motor is connected in the carousel center outside, constitutes the eccentric wheel to realize carousel eccentric rotation. The utility model discloses utilizeflowing water and eccentric rotation, can mildly get rid of attached to the cultivation matrix on the root system to obtain complete root system, and it is little to the damage of the tender root system of children, root system collection rate is high. The rotational speed and the velocity of flow of intaking of motor can be adjusted, can adapt to different plant roots's collection.