Lifting machine system positioned by bar codes

The utility model relates to a lifting machine system positioned by bar codes in an automobile production conveying line. The lifting machine system comprises a lifting machine and a lifting machine control system; the lifting machine comprises upright posts, lifting devices and a horizontal conveying device; the lifting devices are driven by lifting motors to ascend or descend along the upright posts; the bar codes are vertically arranged beside the upright posts; bar code readers are mounted on the lifting devices; signal output ends of the bar code readers are connected to the lifting machine control system; the bar code readers ascend or descend along with the lifting devices, read out the position information on the bar codes, and send the position information to the lifting machine control system. The lifting machine system has the advantages that the number of sensors and contact pieces is decreased, the inspection precision is high, and the reliability of equipment is improved.