Adjustable welding auxiliary holder, with rubber gasket at the bottom, stable and flexible, the base can be adjusted according to different widths of the circuit board, the maximum can be adjusted to 200MM, there are four different thicknesses of the clamp for the circuit board to be put in, the clamp can be rotated 360°, and can be fixed in the required position, improving the convenience and making the work more efficient, and the lightweight design is easy to carry.