The invention relates to the technical field of sand-in-water, discloses a preparation process and a construction process of three-in-one type sand-in-water. A purpose of the invention is to solve theproblems of multiple procedures, long construction period, high labor cost, difficulty in reaching of construction spraying standards and difficulty in standardizing of acceptance standards in the existing construction process. The preparation process comprises: 1, preparing a glue solution; 2, preparing a protection agent; 3, preparing a specially-made color paint; 4, preparing a protection emulsion; and 5, granulating and preparing according to a certain ratio. Compared with the original sand-in-water construction process with characteristics of complex procedure, a large variety of used materials, more control links, high time consumption, high labor consumption, high cost and high construction acceptance difficulty, the construction process of the invention simplifies the multiple procedures and the multiple materials, reduces the time cost and the labor cost, enhances the self-control and self-detection capacity of the constructor, simplifies the acceptance standard, and eliminates the technological operation that a black paint can be covered through full-spraying by the constructor after middle coating.