The invention belongs to the technical field of multi-sensor information fusion, and especially relates to a three-dimensional space turning maneuvering target state estimation method, and a system. According to the three-dimensional space turning maneuvering target state estimation method, position measuring data of three different time points are adopted to obtain a coordinate transformation matrix, the coordinate transformation matrix is adopted for transformation of measuring of the three positions onto an xoy plane, then transformed position measuring data is adopted to estimate target turning rate estimation values and transformed target state estimations, the coordinate transformation matrix is adopted for inverse transformation of transformed target state estimations, and at last,effective estimation of the three-dimensional space turning maneuvering target states is realized. The three-dimensional space turning maneuvering target state estimation method is simple, and efficiency is high.