Mechanical structure of horizontal angle sensor

Provided by the utility model is a mechanical structure of a horizontal angle sensor capable of precisely measuring the horizontal angle value, wherein the mechanical structure is suitable for angle changing measurement of a moving component. The mechanical structure comprises a measuring reference plate that is tightly contacted with a to-be-measured surface during the measuring, wherein the measuring reference plate has a cuboid plat structure; and a measuring plate for installing a measuring component is arranged to be perpendicular to the reference plate. The measuring component includes a large gear wheel; a gear shaft of the large gear wheel is installed at one bearing pedestal on the measuring plate; and the tooth surface of the large gear wheel is provided with a weight block that is always in a vertical state by the power of the gravity. Two bearing pedestals are installed on the measuring plate; one of the bearing pedestals is used for rotatingly installing the gear shaft of the large gear wheel and