PLC-based assembly coordinate off-line calibration method, storage medium and system for automatic assembly production line

The invention discloses an assembly coordinate off-line calibration method, a storage medium and a system for an automatic assembly production line based on a PLC (Programmable Logic Controller). The method specifically comprises the following steps: A, respectively constructing three-dimensional simulation models for machines of a plurality of stations in a production line; b, executing the following steps on the three-dimensional simulation model of each machine: B1, receiving to-be-verified assembly coordinate data, and executing the following verification steps on the to-be-verified assembly coordinate data: B11, according to an assembly point verification instruction, enabling the three-dimensional simulation model of the machine to simulate an assembly action; b12, if the coordinate adjustment data is received, adjusting to-be-verified assembly coordinate data of the assembly point position according to the coordinate adjustment data and then executing B11, and/or if a coordinate data confirmation instr