The invention provides a double-layer loom, and belongs to the technical field of textile machinery. The double-layer loom comprises let-off mechanisms, an opening structure, weft insertion mechanisms, reeling mechanisms and a transmission mechanism, wherein the let-off mechanisms, the weft insertion mechanisms and the reeling mechanisms are respectively two sets in number and are respectively distributed in an up-down mode. The opening structure comprises two yarn lifting heald frames which move up and down in a staggered mode, wherein each yarn lifting heald frame comprises an upper row of yarn lifting openings and a lower row of yarn lifting openings. The double-layer loom is in a double-layer up-down weaving structure and can simultaneously weave two pieces of cloth on the same machine, production efficiency is high, the energy utilization rate of the transmission mechanism is high, the design of the mechanisms is compact, the space utilization rate is high, occupied space of identical cloth production volumes is small, a worker can simultaneously watch the two pieces of the cloth on the same machine, efficiency is high, and labor cost is reduced.