Flexible device for adjusting length of pull rod and use method

The invention provides a flexible device for adjusting the length of a pull rod and a using method, and belongs to the field of aircraft assembly of aeronautical manufacturing engineering.The flexible device comprises a base, sliding rails, sliding blocks, positioning step pins, an electronic control part and the like, a bolt hole is formed in one section of the base, the positioning step pins are screwed into the bolt hole, and the sliding rails are arranged on the two sides of the base; the sliding block is matched with the sliding rail so that the sliding block can slide above the base along the base, positioning step pins are screwed into the sliding block, the two positioning step pins are used for being matched with the inner diameters of bearings at the two ends of the pull rod respectively, and the sliding block is moved to the theoretical length position of the pull rod to be fixed. The length of the pull rod is adjusted so that bearings at the two ends can be just installed on the two positioning st