Screw lead difference measuring tool

The utility model belongs to a measuring tool and particularly relates to a screw lead difference measuring tool. The screw lead difference measuring tool comprises a bottom plate; one end of the bottom plate is provided with a slider; the slider is provided with a ball nut; the ball nut is provided with a screw; the screw is also passed through a clamping block fixed at one end of the bottom plate; a dial indicator is fixed in one side of the clamping block by a lock screw; the side of the slider is provided with a drive screw; the slider is provided with a pull rod matched with the screw; one end of the pull rod is fixed in the slider through a nut. The screw lead difference measuring tool has the advantages that when using the tool, the lead difference of the screw can be measured exactly, and whether the ball screw and the ball nut can meet the requirement is definitely judged, thus removing the formerly judged influence according to the maintenance personnel experience, and ensuring the key component of