The invention discloses a floor heat preservation and sound insulation plate which comprises a plate body made from a polystyrene heat preservation and sound insulation plate. The top surface of the plate body is sequentially provided with a column of barb-shaped mortises. Stand columns are formed between the adjacent mortises. Liquid interface agents are smeared on all the surfaces of the mortises and all the surfaces of the stand columns. The bottom of the plate body is provided with a plurality of damping sound insulation holes. Joints generated in the plate body laying process are filled with seal interface adhesives. The top surface of the plate body is provided with the mortises and the stand columns, the liquid interface agents are smeared on the surfaces of the mortises and the surfaces of the stand columns, meanwhile, the bottom of the plate body is provided with the damping sound insulation holes, and a production procedure and a laying process, of the floor heat preservation and sound insulation plate, provided by the invention are combined, so that the purposes that sufficient contact between the floor heat preservation and sound insulation plate and the wall is ensured, airtightness between sound insulation plates is also ensured, and the laying quality and the sound insulation effect are ensured are achieved.