The invention provides a spatial positioning method and a spatial positioning system, wherein the spatial positioning method comprises the steps of respectively detecting distances of at least three non-collinear points and a to-be-positioned object in a space; and computing relative coordinates of the to-be-positioned object relative to the at least three points according to the distances between the at least three points and the to-be-positioned object, thereby determining the relative position of the to-be-positioned object. The spatial positioning method and the spatial positioning system have advantages of performing spatial positioning and identification on the to-be-positioned object accurately and effectively, and furthermore reducing system deployment cost.