In view of the power quality disturbance detection problem, a power quality disturbance detection algorithm combining morphological filtering and multi-resolution singular value decomposition packet is proposed with current signal as the research object. According to the calculation characteristics of morphological filter, cosine structural elements are adopted. After filtering noise, the multi- resolution SVD packets decomposition is used on the filtered signal. The disturbance can be detected according to the characteristics of the decomposed high frequency components, and combine with the adaptive threshold value to determine whether disturbance occurs. The algorithm is verified by simulation, and the simulation results show that this algorithm has better anti-noise capability compared with common morphological and SVD methods, and can realize fast and accurate positioning of disturbance signals.