The invention provides a micro-reducing self-adjusting method used for a composite material laying orbit, and relates to the technical field of composite material laying moulding. The method has the characteristics as follows: error between a designed orbit and an ideal orbit is judged and calculated so as to adjust a two-step laying orbit slightly along a certain direction, namely, an orbit node with error is firstly adjusted to the ideal orbit slightly; and a reverse micro-adjustment is then carried out on a subsequent node correspondingly according to the micro-adjustment. The method can effectively eliminate error of the designed laying orbit; furthermore, the amount of calculation of the error process is not large.