The invention discloses a near line disk array library with one-dimensionally moving mechanical arms. The library comprises a completely independent driver set, which comprises multiple disk array modules that are arranged in M rows and N columns, wherein M and N are both an integer that is not less than 2; the front ends of the rear ends of the disk array modules are all outward arranged; and thefront ends of the disk array modules are provided with a read-write head. The library also comprises multiple mechanical arms, which can move in a row direction or a column direction in a plane thatis parallel to the front ends of the disk array modules; and a controller, which is used to control the mechanical arms to designated positions so as to connect a data management server and the disk array modules to finish data transmission. The library ahs the advantages of high reliability and convenient maintenance, compared with a typical disc array form, the cost is lower, and the facility stability is obviously enhanced.