Foam concrete and preparation method and application thereof

The invention discloses foam concrete and a preparation method and application thereof. The preparation method includes the steps that a foaming agent with the mixing amount accounting for 0.67-0.73% the cement mass is mixed with water, the dilution ratio is 1: 40, and foam is formed; cement and water are mixed to form cement pulp, the ratio of water to material is 0.40-0.42, and the cement pulp and foam are mixed; a foam stabilizer accounting for 0.02-0.025% the added cement mass, a flash-setting agent accounting for 2.0-3.0% the added cement mass and a water reducing agent accounting for 0.2-0.25% the added cement mass are added, stirred and mixed; finally, casting moulding is conducted. The 3d compressive strength of the foam concrete reaches 1.52 Mpa, the 7d compressive strength reaches 2.69 Mpa, dry density is 443 kg/m , water absorption is 22%, and the heat conduction coefficient is 0.10 W/(m.K). By means of the foam concrete and the preparation method and application thereof, the problems which occur e