In this article, a spatial filter structure damage scanning monitoring method based on the annular array is proposed. The annular piezoelectric sensor array is arranged in the center of the structure to realize the omnidirectional scanning monitoring of the structure, which eliminates the influence of the blind area and far field on the monitoring effect in the active Lamb wave spatial filter monitoring method. The circular array consists of four linear arrays with different angles in the diameter direction. Each linear array uses the active Lamb wave spatial filtering monitoring method to monitor and image the structural damage. The imaging results of each array are fused by the PCA-wavelet transform to identify the location of damage. Thus, the omnidirectional damage scanning monitoring of the structure is realized, and the blind area, far-field, and false imaging of single array damage monitoring are eliminated. Then, more accurate damage monitoring results are obtained. The effectiveness and practicability of the method are verified by experimental research.