The invention provides a waste water recycling device. The device comprises a waste water flow-in pipe, a steam supply pipe, a heater and a waste sludge discharge component. In order to enable waste water drained out of an outer device to flow into the interior to be stored, the waste water flow-in pipe is connected with the lower portion, and in order to enable internally-stored waste to be supplied to industrial water in the outer device in a manner the water is heated to supply in a steam mode, the steam supply pipe is connected with the upper portion; a recycling groove of a waste water flow-in pump is arranged on the waste water flow-in pipe; the heater is arranged in the recycling groove to heat the waste water, and the waste sludge discharge component is arranged on the lower portion of the recycling groove and aims at enabling waste water sludge precipitated on the lower portion of the recycling groove to the discharged outwards; a waste water liquidometer detecting the level of the waste water stored in the recycling groove is arranged in the recycling groove. The waste water recycling device is easy to maintain and manage, and cost can be saved.