The invention discloses a double-layer beam-warping mechanism which comprises a rack, wherein a clapboard is horizontally arranged in the middle of the rack, a passage is arranged at one side of the clapboard, the clapboard divides the rack into an upper layer and a lower layer, a yarn unreeling assembly is arranged on the upper layer, a first rotating roll is arranged at one side of the yarn unreeling assembly, a yarn collecting beam is arranged at one side of the first rotating roll, a tensioning assembly is arranged at one side of the yarn collecting beam, the tensioning assembly is arranged in the passage, a first yarn dividing frame is arranged on the lower layer, the first yarn dividing frame is arranged at the lower part of the tensioning assembly; a second yarn dividing frame, a yarn guide assembly and a third yarn dividing frame are respectively arranged at one side of the first yarn dividing frame; a beam-warping assembly is arranged at one side of the third yarn dividing frame, and a rolling-up assembly is arranged at one end of the rack. The double-layer beam-warping mechanism has the advantages of saving space, and being reasonable in delivery, unlike to knot, clear in layering, accurate in yarn guiding, good in beam-warping quality and the like.