The invention provides a torsional oscillation decoupling measurement method for high-speed face array CCD shafting, comprising: using a helix marking lien on the tested shaft, and upper, lower edge lines on the tested shaft as objects to be shot, the horizontal scanning line of the face array CCD camera is parallel to the tested shaft; shooting image of helix marking line and motion image patch of certain horizontal imaging unit line array of the face array CCD camera on the horizontal line array, the variations of the image patch speed contains torsional oscillation and horizontal oscillation component information of the shaft, meanwhile observing two vertically crossed edge line images shot by the face array CCD camera, central line moving tracks of the two edge lines in the image are horizontal oscillation components of the tested shaft section in primary optical axis orthogonal face of the high-speed CCD camera; via information extraction and separation method, decoupling horizontal oscillation component and torsional oscillation during the image patch motion, in order to realize torsional oscillation measurement on the shafting. The invention has low sensitivity to light intensity or gray scale, low light source requirement, capable of estimating torque and eliminating horizontal oscillation interference.