Plastic and asbestos composite flame-retardant sheet and preparation method and application thereof

The invention relates to a plastic and asbestos composite flame-retardant sheet and a preparation method and application thereof. The sheet is manufactured by combining an upper panel, a middle layer and a lower panel through hot pressing, the upper panel and the lower panel are made from flame-retardant plastic sheets, the middle layer asbestos cloth or fire-proof cloth of which the surface is treated, all layers of materials are laid in sequence and then put into molding equipment to be heated and pressurized, cooling molding is conducted, and then the plastic and asbestos composite flame-retardant sheet is obtained. Compared with the prior art, the plastic and asbestos composite flame-retardant sheet has the advantages that flame retardance and thermal insulation are achieved, the condition that when electric welding operation is conducted, welding slag falls onto the sheet, and a fire cannot be caused can be tolerated, machining is convenient, use is flexible, the sheet can be laid directly to serve as a building material and can be directly nailed on a building formwork to serve as a flame-retardant thermal-insulation layer.