The work aims to expand the effective working scope of industrial robots. A set of complete movable chassis system for industrial robot was established with MITSUBISHI Q series PLC and location module QD75MH1 to mobilize the location of the robot and effectively expand the working scope. Taking four-station palletizing and packaging workstation as an example, the system worked stably, and the working scope of industrial robot was expanded to 4 stations from 2 stations. The work of 4 stations could be com-pleted by 1 industrial robot and the packaging efficiency was increased by 2 times. The system has a good reference value in multi-station palletizing, packaging, handling and other occasions.