The invention relates to a non-cooperative spacecraft spin angular velocity estimation method based on a space circle path. The method is a method for estimating the spin angular velocity and spin direction of a non-cooperative aircraft by utilizing a binocular camera. The method can be used for identifying the spin motion parameter of the space non-cooperative aircraft, has a given engineering application value in the fields such as on-orbit service control, deep space unknown celestial body detection and the like, and belongs to the technical field of on-orbit service. The method of the invention is used for the unknown non-cooperative aircraft on a characteristic point position, and on the premise of not considering the spin nutation, the target spin angular velocity and direction can be directly solved by utilizing a space closed circle path formed by the spin of the characteristic point on the non-cooperative aircraft body. The method is low in requirement for the image quality, and the target spin angular velocity can still be obtained under the situation that the image is fuzzy.