The invention relates to a variable-distance pull rod component assembling tool and method. The method is characterized in that the variable-distance pull rod component assembling tool comprises a bottom plate, a positioning block, a plane positioning component, a V-shaped positioning block, a guiding positioning component, a bevel positioning component and a movable block with an inclined end surface; the positioning block, the V-shaped positioning block, the guiding positioning component and the movable block are all fixed on the upper surface of the bottom plate; the positioning block and the V-shaped positioning block are located on the same straight line; the plane positioning component positions the left-hand end of a part on the upper end surface of the positioning block; the guiding positioning component guides and positions the movable block so that the movable block, the positioning block and the V-shaped positioning block can all be located in the same straight line; and thebevel positioning component fixes the right-hand end of the part to the inclined end surface, and the V-shaped positioning block supports the middle of the part. The variable-distance pull rod component assembling tool is simple in structure and convenient to operate, can meet the requirements of assembling of a variable-distance pull rod component and provides effective data for judging whetherassembling of the variable-distance pull rod component is qualified or not.