The utility model relates to a plain thickener cooling device of charcoal, the device is including filling the cooling tank body that has the cooling water and filling the heat conduction oil coil pipe who has the conduction oil. One side lower part of the cooling tank body is equipped with inlet valve, and its opposite side upper portion is equipped with the outlet valve door, heat conduction oil coil pipe passes the cooling tank body, and its one end is equipped with oil outlet valve, and the other end is equipped with into oil valve, enter oil valve department the last heat conduction oil flow regulation and control valve that is equipped with of heat conduction oil coil pipe. The utility model discloses simple structure, low cost, thus can reach quick reduction conduction oil temperature reaches the purpose for the thickener cooling.