Sand-based colored magnesite cementing material and preparation and usage methods thereof

The invention discloses a sand-based colored magnesite cementing material. The sand-based colored magnesite cementing material is prepared from, by volume, 160-180 parts of light-burned magnesium oxide powder, 100 parts of an aqueous magnesium chloride solution, 0.5-1 part of a coupling agent, 30-50 parts of pigments, 1-3 parts of glue and 0.3-0.5 part of a defoaming agent. The sand-based colored magnesite cementing material has the advantages that the bottom face of a product prepared from the material presents the light and bright color; solarization resistance is achieved, the extremely high durability and color stability are achieved in various severe weather environments, pulverizing and falling cannot occur, and the color is not prone to change; the water resistance is achieved, the water-resistant performance is good, moisture absorption is not prone to occur, dew forming and whitening cannot occur on the surface of the product, and the using performance of the product cannot be damaged; the scrubbing