The AOT-H-01-Арз apparatus allows producing oxygen-ozone mixture used for medical purposes. The AOT-H-01-Арз apparatus allows producing the oxygen-ozone mixture with the preset ozone concentration. Ozone concentration in the mixture, procedure duration are set by means of controls and indicated on the display. Automatic gas supply system provides flow continuity of the oxygen-ozone mixture produced by thе apparatus. The control system automatically stops operation (turns the apparatus into the standby mode) in case the normal operating conditions cannot be observed. Availability of the independent gas pump expands the apparatus range of application. Remote decomposer provides safety for patients and personnel. All these advantages together with high accuracy of the concentration setting (error is ± 15% max) give a unique possibility to treat wide scope of diseases and to concentrate the doctor's attention exclusively on the patient.