The present invention relates to a composite imitation marble lacquer. The natural stone wall decoration material has the defects of large usage, high construction difficulty, poor safety, large color variation, monotone colors, high cost, etc. The composite imitation marble lacquer can replace the natural stone wall decoration material to resolve the defects. The composite imitation marble lacquer is mainly prepared with the following materials: colored sand, silicone-acrylate emulsion, plasma water, cellulose, organic amine, ethylene glycol, multi-functional assistant, defoamer, mildew preventive and filming assistant. The composite imitation marble lacquer has the following advantages: natural resources are saved, and the cost is low; the colors of the natural colored sand cannot easily be faded, moreover, the colors are diversified, the color variation is little, and the composite imitation marble lacquer is applicable to the decoration of the outer walls of buildings with various building styles and ethnical styles and has a natural and noble decoration effect and a high decoration grade; the composite imitation marble lacquer can seep into various basal surfaces, firmly adhere to the outer walls and resist cracking, and after being soaked in water for thirty days, the composite imitation marble lacquer does not turn into white and is not flaked; construction and filming cannot be affected by low-temperature and humid climates; as dense, transparent finish, the composite imitation marble lacquer can extremely resist stain, and the surface can be washed.