Leveling reflector device and horizontal line quick releasing method thereof

The invention relates to a building construction measurement line releasing method, in particular to a leveling reflector device and a horizontal line quick releasing method thereof. The leveling reflector device is a plane mirror, the direction of the plane mirror can be rotated, and the mirror surface of the plane mirror is perpendicular to the horizontal plane. The method comprises the steps of respectively erecting a laser line marker and the leveling reflector device, erecting the laser line marker in the middle of a house with the know elevation, erecting the leveling reflector device at the cross position of a house doorway, enabling the horizontal light emitted from the laser line marker to light a wall body and a reflector of the leveling reflector device, moving the leveling reflector device to the intersection angle position of two houses, enabling the horizontal light projected on the reflector to horizontally coincide with a + sign on the reflector, rotating the reflector to transmit the horizontal light to another house and using an ink fountain to mark the horizontal elevation line according to the transmitted horizontal light, namely the horizontal line is identical with the horizontal line protected by the laser line marker. The leveling reflector device can reduce measurement error and can achieve the purpose of quickly releasing lines.