The invention relates to a two-dimensional code based electric control door lock, which comprises a mainboard. The mainboard consists of a display, a scanner, a two-dimensional code generator, and a GSM transmitter. Two-dimensional codes are generated by the two-dimensional code generator every day and are transmitted to inhabitants through the GSM transmitter, and the scanner scans the two-dimensional codes given by the inhabitants to unlock door locks. The two-dimensional code based electric control door lock provided by the invention has the advantage of high safety.