Low-density composite foaming cement and preparation method thereof

The invention discloses low-density composite foaming cement and a preparation method thereof, relating to a light building material. The foaming cement is prepared by adopting a normal-temperature foaming technology, and comprises the following components in parts by weight: 100 parts of cement, 10-50 parts of active admixture, 1-5 parts of redispersible emulsion powder, 1-4 parts of water repellent, 0.5-1.5 parts of cellulose ether, 0.3-0.7 parts of reinforced fiber, 0.2-0.5 parts of foam stabilizer, 3-8 parts of foaming agent and 50-80 parts of water. The method comprises the following preparation steps of: proportionally mixing and stirring the cement, active admixture, redispersible emulsion powder, water repellent, cellulose ether, reinforced fiber, foam stabilizer, and water into cement slurry; adding the foaming agent; and stirring, molding by casting and naturally curing. The foaming cement disclosed by the invention has the advantages of low volume weight, small heat conducting coefficient, small shrinkage ratio, high intensity, integration of heat preservation, sound insulation, fire prevention and low carbon, simple and convenient production preparation process and easiness in controlling.