Water tank for machining

The utility model discloses a water tank for machining, which comprises a shell with a liquid inlet side and a liquid taking side, at least one first sub-cavity and at least one second sub-cavity, a plurality of partition plates are arranged in the shell, so that a plurality of accommodating cavities are formed in the shell, and the first sub-cavity and the second sub-cavity are communicated with each other. A first communication area is arranged between a containing cavity internally provided with the first sub-cavity and a containing cavity which is located at the upper stage and provided with a second sub-cavity, and the second sub-cavity is located on the liquid inlet side. According to the water tank for machining, waste water is subjected to residue removal and filtration, so that the waste water is recycled, water resources are saved, meanwhile, pollution to the environment and shutdown caused by water change are avoided, the second sub-cavity can recycle metal residues and turn the metal residues into