The invention discloses a solution reactor clean reactor. The solution reactor clean reactor is characterized in that the power is 200kW; a reactor core which is arranged at the outside of a reactor vessel is a flat bottom cylinder reactor core; the ratio of height to diameter of the core body of the reactor core is 0.80-1.12, and the diameter of the core body is 50-56cm; and the fuel solution which is arranged in the reactor vessel is uranium uranyl fuel solution, and the uranium uranyl concentration is 40-46gU/L, and the 235U enrichment degree in the fuel solution is 50-90%. The solution reactor clean reactor can improve the core body and the solution fuel, can reduce the loaded 235U amount to 2.68-2.71Kg, and can greatly reduce the load of the 235U.