The invention belongs to the technical field of marine module drill drilling, and discloses a switchable rock debris distribution box. The switchable rock debris distribution box includes a distribution box body with an upper opening, and the distribution box body is located below a rock debris discharging main pipe; a bottom plate of the distribution box body is formed by a horizontal plane and inclined faces, wherein the horizontal plane is located at the middle, and the inclined faces are located at the two sides, a sea discharging port and a collection port are formed in the inclined facesof the bottom plate of the distribution box body, and a liquid discharging port is formed in horizontal plate of the bottom plate of the distribution box body; a fixed baffle is arranged on the portion, at one side the sea discharging port, of the interior of the distribution box body and is used for leading rock debris into the sea discharging port; a rotary baffle is arranged at the portion, atone side the collection port, of the interior of the distribution box body and is used for switching and leading the rock debris into the collection port. According to the switchable rock debris distribution box, box interior switching is adopted to replace valve switching, therefore, the construction cost is reduced, the defects are overcome that because a valve is not closed tightly, the rock debris with oil is discharged into sea and then pollutes environment, and the switchable rock debris distribution box has the advantages of being simple in structure, various in function, good in economical efficiency and high in practicability.