Welding tool for front rack component of excavator

The utility model belongs to the technical field of welding tools, and discloses a welding tool for a front rack component of an excavator, which comprises a support, a support plate, a plurality of groups of support components, a first positioning component, a second positioning component, a locking component and a plurality of groups of top leveling components. The supporting assembly can adjust the supporting height in the Z direction. The first positioning assembly and the second positioning assembly can position the triangular bottom plate, the first plate, the second plate, the third plate, the fourth plate and the fifth plate correspondingly so as to guarantee the position precision of the components. The locking assembly is used for locking the triangular bottom plate, the first plate, the third plate, the fourth plate and the fifth plate so as to prevent the positioned part from position deviation, the top flattening assembly can flatten the triangular bottom plate in the Z direction so as to reduce