Abstract: In the field of current measurement in power systems, magnetic sensor arrays have the advantages of non-contact, small size, high linearity, strong anti-interference ability, small temperature drift, wide frequency band, and low cost. In this paper, the research of magnetic sensor array technology in the field of current measurement in power systems is reviewed. Moreover, the magnetic sensor array schemes corresponding to different measured objects are introduced, the research progress of common magnetic sensor array schemes such as circular array and rectangular array is summarized, and the common error sources of magnetic sensor array schemes such as eccentricity, crosstalk, and tilt are analyzed. Existing studies have shown that magnetic sensor array technology has advantages in low cost, high accuracy, wide range, wide bandwidth, and non-contact design, and it will have a wider range of applications in smart grids in the future.