The invention discloses a producing and manufacturing process of a heat preservation and plastic decoration integrated irregular wall board. The producing and manufacturing process comprises the following steps of external mold splicing, cleaning and oiling treatment, steel reinforcement cage putting and embedded part installation, temporary baffle installation and external steel falling, heat preservation board laying and removal of external molds and temporary baffles, structural steel reinforcement cage placement and mold installation, and surface treatment after structural steel falling and product formwork removal and hoisting. Compared with the prior art, a construction process is simple, the safety is good, heat preservation boards have a heat preservation effect, the thickness of the heat preservation boards is preferably 3-6 cm, the heat preservation effect is ensured, materials are not wasted, and reasonable resource utilization is achieved. In addition, the external molds include steel molds and flexible molds, decorating grooves are formed in the flexible molds, and the outer surface of the wall board is provided corresponding patterns. Therefore, external veneer decoration is not needed in a construction site, a large number of labor and material resources can be saved, and lots of potential safety hazards in aloft working and the like are avoided.