The utility model relates to a digit control machine tool field, concretely relates to solid -liquid separation water tank drawer, including the bottom plate, connect in the terminal filter of bottom plate, enclose and locate bottom plate and filter first curb plate, second curb plate, third curb plate and fourth curb plate all around, first curb plate and third curb plate set up relatively, second curb plate and fourth curb plate symmetry set up, the upper surface of bottom plate is the inclined plane, connects one side of the first curb plate of a lateral binding of filter certainly, and the upper surface of bottom plate uprises gradually, the upper surface minimum of bottom plate is higher than the upper surface of filter, the filtration pore had evenly been offered on the filter, the size of crossing the filtration pore is lighter than the size of iron fillings. The utility model discloses iron fillings and coolant liquid separation, iron fillings can be realized and resources are saved is cleared up, is favorable to alone.