Medical wastewater harmless treatment system and treatment method

The invention relates to the technical field of medical wastewater treatment, in particular to a harmless treatment system and method for medical wastewater. Medical wastewater is injected into the disinfection box through a feeding pipe, a screen is used for filtering, and a disinfection assembly is started to spray and disinfect the wastewater in the disinfection box; a first stirring assembly and a second stirring assembly are started at the same time, and internal wastewater is fully disinfected; after disinfection is completed, a valve on the side edge of the pipeline is opened, the disinfected wastewater is injected into the fixed box, and then a medical worker injects a disinfectant through a dosing pipe to strengthen disinfection of the wastewater; after disinfection is completed again, the medical wastewater is injected into the purification box through the connecting pipe, is purified through the purification assembly in the purification box and is discharged through the drainage pipe on the side ed