The invention discloses a manufacturing technology for a building module unit. The manufacturing technology comprises the following steps of (1) light-weight slurry preparing, (2) base material preparation, (3) frame welding, (4) transverse beam arranging, (5) reinforced steel mesh arranging, (6) light-weight slurry filling, and (7) surface processing. The manufacturing technology is simple, the building module unit obtained through the manufacturing technology has the advantages of being light in weight, capable of saving energy and environmentally friendly; filling is conducted by adopting prepared light-weight slurry, a house is firmer, and the energy-saving environment-friendly effect is achieved better; meanwhile, by adding multiple kinds of powder, the light weight, heat preservation, fireproof, waterproof and noise prevention functions are achieved; and by adding landscaping waste fibers, energy saving and environment protection are achieved, the production period is short, andthe manufacturing technology has the wide market prospects.