The invention discloses a method and a system of simultaneously burning multiple television KEY codes on line. The method comprises: pre-configuring an address configuration file and a solution configuration file, and then synthesizing to-be-burnt data by combining an input starting barcode number, a starting DTV (digital television) serial number, the quantity of orders, MAC (medium access control) code data and KEY code data with the address configuration file and the solution configuration file; when a burner detects the to-be-burnt data selected by a user, acquiring a barcode by scanning with a barcode gun connected with the burner, acquiring a burning address, a burning MAC address, a DTV serial number and KEY code data according to the to-be-burnt data and the barcode, and burning and storing the MAC addresses, the DTV serial number and the KEY code data to an EEPROM (electrically erasable programmable read-only memory) of a television. According to the method of simultaneously burning multiple television KEY codes on line provided by the invention, the machine barcode, the HDCP (high-bandwidth digital-content copy protection) KEY, the MAC address, the Miracast KEY and the DTV serial number can be simultaneously burnt to the television once on line; furthermore, a plurality of television KEY codes can be recorded accurately and can be stored at specific locations in a report form.