Telescopic folding ruler for measuring perpendicularity of wall body

The utility model discloses a telescopic folding ruler for measuring the perpendicularity of a wall body, which comprises a horizontal rod and a vertical rod, and the horizontal rod is perpendicular to the vertical rod; an inner rod is movably arranged in the horizontal rod, and a spring buckle clamped and fixed with the horizontal rod is arranged on the inner rod; and the end part of the vertical rod is connected with a telescopic rod. The device has the beneficial effects that after the device is used, the inner rod can be stored in the horizontal rod, storage of the inner rod is achieved, the device is integrally shrunk to be in a small state in cooperation with shortening of the telescopic rod, and therefore the device can be conveniently moved, taken and stored; during use, a constructor only needs to move the folding ruler up and down through an arm to complete the measurement work of a wall body, so that the working intensity of the constructor can be reduced, and the construction progress is accelerat