Treatment system and treatment method for snow-melting agent snow melting wastewater

The invention provides a treatment system for snow-melting agent snow melting wastewater. The treatment system comprises a snow-melting agent snow melting wastewater collecting system (1), a snow-melting agent snow melting wastewater storage system (2) and a snow-melting agent snow melting wastewater treatment system (3). A corresponding treatment method includes the steps that the wastewater is conveyed to a flocculation precipitator through the snow-melting agent snow melting wastewater collecting system and the storage system, a high-efficiency flocculant and a coagulant aid are added, suspended matter and a colloidal substance are separated out and precipitated at the bottom, supernate overflows and enters an intermediate water tank, and solid impurities are thoroughly removed throughfiltration by quartz sand and activated carbon; after an antisludging agent is added, sewage enters a reverse osmosis system for desalination treatment, and fresh water produced reaches the third-level standard of surface wat