Positioning system for workpiece to be welded

The utility model discloses a to-be-welded workpiece positioning system which comprises a first positioning device, and the first positioning device comprises a first positioning mechanism and a first frame mechanism. And the second positioning device comprises a second positioning mechanism and a second frame mechanism. The to-be-welded workpiece positioning system is mainly suitable for positioning of workpieces within a certain deformation range, if the workpieces deform excessively, the second positioning device can be adjusted at any time in the running process, and positioning precision and running smoothness are guaranteed. A positioning arm of the first positioning device and a positioning wheel unit and a pressing wheel unit of the second positioning device are independently controlled, the size of a bottom positioning opening can be adjusted, and the application range is wide. The positioning mode of the second positioning device is that two sets of positioning wheel units on the two sides are used