The invention provides a dry desulphurization dust removal system and a smoke water saving apparatus thereof, which can effectively recycle water contained in clean smoke subjected to the dry desulphurization and dust removal, can supply the water to a desulphurization procedure for use, and can realize zero water consumption of the dry desulphurization dust removal system. The smoke water saving apparatus comprises a high temperature heat exchanger and a low temperature heat exchanger, wherein the low temperature heat exchanger is provided with a low temperature flue, a recycled water port and a coolant flow passage, the high temperature heat exchanger is provided with a high temperature flue and a cold flue, an inlet of the high temperature flue is used for introducing the clean smoke subjected to the dry desulphurization and dust removal, an outlet is communicated with an inlet of the low temperature flue, and an inlet of the cold flue is communicated with an outlet of the low temperature flue; and the clean smoke in the low temperature flue is cooled by coolant in the coolant flow passage into saturated wet smoke, and the recycled water port is used for recycling water condensed and carried in the over-saturated wet smoke.