The utility model discloses an it welds to be convenient for nozzle stub and flange for the continuous flange nozzle stub welding positioner of welding seam. This welding positioner is including bottom plate, support column, roof, slider, the support column sets up between bottom plate and roof, support column one end and roof fixed connection, the other end are used the axis of support column to rotate as the pivot and are installed on the bottom plate for the bottom plate, be provided with two sliders on the roof, the length direction slidable mounting that slider edge roof has is on the roof, slider one end is provided with the fixed plate, be provided with on the slider and be used for the locking device of slider locking on the bottom plate, be provided with the locking board on the fixed plate, locking board one end and a fixed plate sliding connection, and lock to be provided with on the board and be used for locking the 2nd locking device on this fixed plate with the locking board, the other end is located the top of another fixed plate. Adopt this welding positioner to be convenient for operate, can improve welding efficiency, guarantee welding quality.