A light detection and ranging (LiDAR) system is provided. The present embodiment provides a LiDAR system in which side angles of a rotating polygon mirror having multiple facets are diversified to change an angle of a laser beam refracted from a side facet, thereby sensing a plurality of vertical lines at the same time. The present embodiment provides a LiDAR system which allows an object to be sensed with a circular pattern, a circular matrix pattern, or a line matrix pattern by diversifying a pattern of a laser beam oscillated due to the rotation of a rotating polygon mirror having multiple facets and a wedge prism.