The invention discloses a production method of ultra-black wool worsted fabric. According to the method, wool tops after wool mercerizing shrink-proof treatment are selected as raw materials, and theraw materials are successively subjected to dyeing, back washing, secondary dyeing, sliver mixing, carding, combing, re-combing, roving, spun yarns, cabling tube, yarn steaming, weaving, wet finishing, dry finishing and functional colour-increased finishing to prepare finished products. Wool and polyester fibers are all treated with secondary dyeing to increase the color thickness after dyeing, and auxiliaries are used for processing to increase blackness and color depth of the fabric; secondly, wool fibers and the polyester fibers are subjected to the back washing after top dyeing, secondarydyeing is conducted again, and dye-uptake of dye and the color depth are further increased; meanwhile warps and wefts of the fabric are made by the secondarily dyed wool which is treated with the re-combing and spinning later, so that the color depth and apparent depth of the black worsted fabric produced are greatly deepened; finally, an intensifier deep agent and a penetrating agent are used forfurther processing in a soft padding groove during a finishing process, thereby further improving the dyeing depth of the wool fabric.