The invention discloses a thermal-insulation wallboard and a production method thereof. The thermal-insulation wallboard is characterized by comprising, by weight, 100-200 parts of cement, 50-80 parts of silica fume, 100-150 parts of high-calcium fly ash, 60-100 parts of steel slag powder, 40-60 parts of lead-zinc tailing powder, 40-60 parts of quartz sand powder, 20-70 parts of fiber, 600-900 parts of steel slag aggregate, 150-200 parts of water and 6-8 parts of water reducing agent. The thermal-insulation wallboard has the advantages that the problem that a cement fiber wallboard produced through extrusion molding is large in cement use amount and high in cost is solved first, and the problem that the application of the high-calcium fly ash, the steel slag power, the steel slag aggregate and the lead-zinc tailings is limited in actual application due to characteristics of the high-calcium fly ash, the steel slag power, the steel slag aggregate and the lead-zinc tailings is also solved.