The invention relates to a composite adhesive, and method therewith for molding calcium carbide raw materials. The composite adhesive includes an A component and a B component. The A component is biomass fibers and the B components is one or two selected from tar residue and asphalt. The weight part ratio of the A component to the B component is 1:(0.3-10). The method for molding calcium carbide raw materials with the composite adhesive includes the following steps: uniformly mixing quicklime powder, the composite adhesive and coal powder to prepare a mixed material, and successively heating and press-moulding the mixed material to prepare calcium carbide raw material pellets. The addition amount of the composite adhesive is 5-30 wt% of the total weight of the quicklime powder and the coal powder. The method has low raw material cost and is environment-protective. The calcium carbide raw material pellets have good anti-impact performance. The method is simple and increases comprehensive benefit of production of calcium carbide.