Gap measuring tool

The utility model relates to a gap measuring tool, which comprises a scale and a sliding mechanism, and is characterized in that the scale is provided with scales along the lengthwise extension direction; the sliding mechanism is in sliding connection with the ruler, the sliding mechanism is provided with marking lines corresponding to the scales, and one end of the sliding mechanism is provided with a first tip used for stretching into the gap. According to the gap measuring tool, the first tip is arranged, when the first tip is tightly attached to the opposite side walls of the gap to be measured, the distance between the side walls can be determined by the size of the first tip, and the distance between the side walls can be determined due to the fact that the relation between the size of the first tip and the depth of the portion, extending into the gap to be measured, of the first tip can be determined. Therefore, the dimension value of the gap to be measured can be obtained by reading the scales on the