The present invention discloses a construction technology of building external wall decorations simulating a stone cladding effect. As for an external wall constructed according to the construction technology provided by the present invention, corrosion resistance, crazing resistance, water resistance and radio resistance of the external wall are greatly raised, and the external wall is hard and firm in structure, is mixed with a building wall into an integral body and permanently stays colored. Later-period loads of a building are effectively reduced. With adoption of mixture of quartz sand of different colors, the constructed wall can simulate various natural stones, thus to achieve the stone cladding effect.