Detachable and portable length-variable magnetically-connected abacus

The utility model discloses a detachable portable length-variable magnetically-connected abacus which can achieve easy detachment and reliable magnetic connection and can be assembled randomly. The detachable portable length-variable magnetically-connected abacus consists of frames with grooves or lug bosses, beams with grooves or lug bosses, baffle plates, upper beads, lower beads and strong magnets, wherein the frames with the grooves or the lug bosses are inlaid with the beams with the grooves or the lug bosses respectively; the strong magnets are fixed on the grooves and the lug bosses at junctions to ensure reliable connection. When the abacus is used, different sections can be selected according to different occasions and are randomly assembled for use; when the abacus is not used, different sections of the abacus can be detached, so that the abacus is convenient to carry about; the detachable portable length-variable magnetically-connected abacus can achieve aims of easy detachment and mounting, assemblability, convenient carrying and reliable connection.