The invention provides a metal chip collecting tank which can be used for collecting metal chips. The metal chip collecting tank is characterized in that a collecting tank (2) is of a closed tank structure with an 'n'-shaped cross section, two flip covers (21) are symmetrically hinged to two sides of the top of the collecting tank (2), a tail door (22) for dumping the chips is arranged at the rear of the collecting tank (2), a detachable cutting liquid collecting box (23) is arranged at the bottom of the collecting tank (2) and is adjacent to the tail door (22), and the upper portion of the tail door (22) is hinged to the top of the collecting tank. The metal chip collecting tank has the advantages that metal chip collection can be improved, accordingly, environmental pollution can be prevented in collecting and transferring procedures, the work efficiency can be improved, and investment in the aspect of building foundations of chip stacking places can be reduced.